diff --git a/boost/fiber/fiber.hpp b/boost/fiber/fiber.hpp
index 21ca87c2..8261b205 100644
--- a/boost/fiber/fiber.hpp
+++ b/boost/fiber/fiber.hpp
@@ -305,6 +305,9 @@ public:
     }
 #endif
 
+    ~fiber()
+    { if ( impl_) join(); }
+
     fiber( BOOST_RV_REF( fiber) other) BOOST_NOEXCEPT :
         impl_()
     { swap( other); }
diff --git a/libs/fiber/test/test_fiber.cpp b/libs/fiber/test/test_fiber.cpp
index 0ed3cf37..5f6b773f 100644
--- a/libs/fiber/test/test_fiber.cpp
+++ b/libs/fiber/test/test_fiber.cpp
@@ -190,7 +190,7 @@ void test_cancel()
         // s' yields in its fiber-fn
         // s cancels s' and completes
         stm::fiber s( f3);
-        BOOST_CHECK( stm::run() );
+        BOOST_CHECK( ! stm::run() );
         BOOST_CHECK( ! s);
         BOOST_CHECK( ! stm::run() );
     }
diff --git a/libs/fiber/test/test_futures.cpp b/libs/fiber/test/test_futures.cpp
index 66835eac..4c1261a0 100644
--- a/libs/fiber/test/test_futures.cpp
+++ b/libs/fiber/test/test_futures.cpp
@@ -1016,7 +1016,7 @@ void wait_for_either_invokes_callbacks()
     stm::unique_future<int> fi2=pt2.get_future();
     pt.set_wait_callback(wait_callback_for_task);
 
-    stm::fiber(boost::move(pt));
+    stm::fiber f(boost::move(pt));
     stm::waitfor_any(fi,fi2);
     
     BOOST_CHECK(fi.get()==42);