diff --git a/example/cpp11/asymmetric/await_emu.cpp b/example/cpp11/asymmetric/await_emu.cpp
index 4cabff2..cbc1c2a 100644
--- a/example/cpp11/asymmetric/await_emu.cpp
+++ b/example/cpp11/asymmetric/await_emu.cpp
@@ -48,7 +48,7 @@ public:
     void push(U &&u)
     {
         boost::lock_guard<boost::mutex> l(m);
-        q.push( forward<U>(u) );
+        q.push( boost::forward<U>(u) );
         c.notify_one();
     }
     void pop(T &result)
diff --git a/include/boost/coroutine/asymmetric_coroutine.hpp b/include/boost/coroutine/asymmetric_coroutine.hpp
index 549cf62..aada349 100644
--- a/include/boost/coroutine/asymmetric_coroutine.hpp
+++ b/include/boost/coroutine/asymmetric_coroutine.hpp
@@ -479,7 +479,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -507,7 +507,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -535,7 +535,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -563,7 +563,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -869,7 +869,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -897,7 +897,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -925,7 +925,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -953,7 +953,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -1255,7 +1255,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -1283,7 +1283,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -1311,7 +1311,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -1339,7 +1339,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
         impl_->pull();
     }
@@ -1522,7 +1522,7 @@ push_coroutine< Arg >::push_coroutine( coroutine_fn fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1550,7 +1550,7 @@ push_coroutine< Arg >::push_coroutine( coroutine_fn fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1577,7 +1577,7 @@ push_coroutine< Arg & >::push_coroutine( coroutine_fn fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1605,7 +1605,7 @@ push_coroutine< Arg & >::push_coroutine( coroutine_fn fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1631,7 +1631,7 @@ inline push_coroutine< void >::push_coroutine( coroutine_fn fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1658,7 +1658,7 @@ push_coroutine< void >::push_coroutine( coroutine_fn fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 # endif
@@ -1686,7 +1686,7 @@ push_coroutine< Arg >::push_coroutine( BOOST_RV_REF( Fn) fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1714,7 +1714,7 @@ push_coroutine< Arg >::push_coroutine( BOOST_RV_REF( Fn) fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1742,7 +1742,7 @@ push_coroutine< Arg & >::push_coroutine( BOOST_RV_REF( Fn) fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1770,7 +1770,7 @@ push_coroutine< Arg & >::push_coroutine( BOOST_RV_REF( Fn) fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1797,7 +1797,7 @@ push_coroutine< void >::push_coroutine( BOOST_RV_REF( Fn) fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 
@@ -1824,7 +1824,7 @@ push_coroutine< void >::push_coroutine( BOOST_RV_REF( Fn) fn,
     BOOST_ASSERT( 0 < internal_stack_ctx.size);
     // placement new for internal coroutine
     impl_ = new ( internal_stack_ctx.sp) object_t(
-            forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+            boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
     BOOST_ASSERT( impl_);
 }
 #else
diff --git a/include/boost/coroutine/detail/pull_coroutine_object.hpp b/include/boost/coroutine/detail/pull_coroutine_object.hpp
index acc9a57..cfe34bd 100644
--- a/include/boost/coroutine/detail/pull_coroutine_object.hpp
+++ b/include/boost/coroutine/detail/pull_coroutine_object.hpp
@@ -98,7 +98,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
@@ -186,7 +186,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
@@ -274,7 +274,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
diff --git a/include/boost/coroutine/detail/push_coroutine_object.hpp b/include/boost/coroutine/detail/push_coroutine_object.hpp
index 1a0aa7e..1a39c07 100644
--- a/include/boost/coroutine/detail/push_coroutine_object.hpp
+++ b/include/boost/coroutine/detail/push_coroutine_object.hpp
@@ -110,7 +110,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
@@ -198,7 +198,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
@@ -286,7 +286,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
diff --git a/include/boost/coroutine/detail/setup.hpp b/include/boost/coroutine/detail/setup.hpp
index a776029..35f601a 100644
--- a/include/boost/coroutine/detail/setup.hpp
+++ b/include/boost/coroutine/detail/setup.hpp
@@ -41,7 +41,7 @@ struct setup
            coroutine_context * caller_,
            coroutine_context * callee_,
            attributes const& attr_) :
-        fn( forward< Fn >( fn_) ),
+        fn( boost::forward< Fn >( fn_) ),
         caller( caller_),
         callee( callee_),
         attr( attr_)
@@ -58,7 +58,7 @@ struct setup
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn( fn_),
 #else
-        fn( forward< Fn >( fn_) ),
+        fn( boost::forward< Fn >( fn_) ),
 #endif
         caller( caller_),
         callee( callee_),
diff --git a/include/boost/coroutine/detail/symmetric_coroutine_call.hpp b/include/boost/coroutine/detail/symmetric_coroutine_call.hpp
index a695795..a499275 100644
--- a/include/boost/coroutine/detail/symmetric_coroutine_call.hpp
+++ b/include/boost/coroutine/detail/symmetric_coroutine_call.hpp
@@ -75,7 +75,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 
@@ -100,7 +100,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 # endif
@@ -125,7 +125,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 
@@ -150,7 +150,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 #else
@@ -335,7 +335,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 
@@ -360,7 +360,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 # endif
@@ -385,7 +385,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 
@@ -410,7 +410,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 #else
@@ -595,7 +595,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 
@@ -620,7 +620,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< coroutine_fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 # endif
@@ -645,7 +645,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 
@@ -670,7 +670,7 @@ public:
         BOOST_ASSERT( 0 < internal_stack_ctx.size);
         // placement new for internal coroutine
         impl_ = new ( internal_stack_ctx.sp) object_t(
-                    forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
+                    boost::forward< Fn >( fn), attrs, stack_ctx, internal_stack_ctx, stack_alloc); 
         BOOST_ASSERT( impl_);
     }
 #else
diff --git a/include/boost/coroutine/detail/symmetric_coroutine_object.hpp b/include/boost/coroutine/detail/symmetric_coroutine_object.hpp
index c7516f9..a1c0c05 100644
--- a/include/boost/coroutine/detail/symmetric_coroutine_object.hpp
+++ b/include/boost/coroutine/detail/symmetric_coroutine_object.hpp
@@ -74,7 +74,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
@@ -155,7 +155,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)
@@ -236,7 +236,7 @@ public:
 #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
         fn_( fn),
 #else
-        fn_( forward< Fn >( fn) ),
+        fn_( boost::forward< Fn >( fn) ),
 #endif
         stack_ctx_( stack_ctx),
         stack_alloc_( stack_alloc)