diff --git a/include/boost/signals/detail/named_slot_map.hpp b/include/boost/signals/detail/named_slot_map.hpp
index 9b6458b..5851543 100644
--- a/include/boost/signals/detail/named_slot_map.hpp
+++ b/include/boost/signals/detail/named_slot_map.hpp
@@ -59,7 +59,7 @@ public:
   typedef const stored_group& first_argument_type;
   typedef const stored_group& second_argument_type;
 
-  group_bridge_compare(const Compare& c) : comp(c) 
+  group_bridge_compare(const Compare& c) : comp(c)
   { }
 
   bool operator()(const stored_group& k1, const stored_group& k2) const
@@ -92,15 +92,15 @@ class BOOST_SIGNALS_DECL named_slot_map_iterator :
                           connection_slot_pair,
                           forward_traversal_tag> inherited;
 public:
-  named_slot_map_iterator() : slot_assigned(false) 
+  named_slot_map_iterator() : slot_assigned(false)
   { }
-  named_slot_map_iterator(const named_slot_map_iterator& other) 
+  named_slot_map_iterator(const named_slot_map_iterator& other)
     : group(other.group), last_group(other.last_group),
     slot_assigned(other.slot_assigned)
   {
     if (slot_assigned) slot_ = other.slot_;
   }
-  named_slot_map_iterator& operator=(const named_slot_map_iterator& other) 
+  named_slot_map_iterator& operator=(const named_slot_map_iterator& other)
   {
     slot_assigned = other.slot_assigned;
     group = other.group;
@@ -108,11 +108,11 @@ public:
     if (slot_assigned) slot_ = other.slot_;
     return *this;
   }
-  connection_slot_pair& dereference() const 
+  connection_slot_pair& dereference() const
   {
     return *slot_;
   }
-  void increment() 
+  void increment()
   {
     ++slot_;
     if (slot_ == group->second.end()) {
@@ -126,7 +126,7 @@ public:
         || slot_ == other.slot_));
   }
 
-#if BOOST_WORKAROUND(_MSC_VER, <= 1700)
+#if BOOST_WORKAROUND(_MSC_VER, <= 1900)
   void decrement();
   void advance(difference_type);
 #endif
diff --git a/src/named_slot_map.cpp b/src/named_slot_map.cpp
index ac9a292..2fe2790 100644
--- a/src/named_slot_map.cpp
+++ b/src/named_slot_map.cpp
@@ -24,7 +24,7 @@ typedef slot_container_type::iterator group_iterator;
 typedef slot_container_type::const_iterator const_group_iterator;
 
 
-#if BOOST_WORKAROUND(_MSC_VER, <= 1700)
+#if BOOST_WORKAROUND(_MSC_VER, <= 1900)
 void named_slot_map_iterator::decrement() { assert(false); }
 void named_slot_map_iterator::advance(difference_type) { assert(false); }
 #endif