diff --git a/include/boost/smart_ptr/intrusive_ptr.hpp b/include/boost/smart_ptr/intrusive_ptr.hpp
index 6927a59..0e30ece 100644
--- a/include/boost/smart_ptr/intrusive_ptr.hpp
+++ b/include/boost/smart_ptr/intrusive_ptr.hpp
@@ -122,7 +122,7 @@ public:
 
     intrusive_ptr & operator=(intrusive_ptr && rhs)
     {
-        this_type(std::move(rhs)).swap(*this);
+        this_type( static_cast< intrusive_ptr && >( rhs ) ).swap(*this);
         return *this;
     }
 
diff --git a/include/boost/smart_ptr/shared_ptr.hpp b/include/boost/smart_ptr/shared_ptr.hpp
index 1b367f0..8256d00 100644
--- a/include/boost/smart_ptr/shared_ptr.hpp
+++ b/include/boost/smart_ptr/shared_ptr.hpp
@@ -368,14 +368,14 @@ public:
 
     shared_ptr & operator=( shared_ptr && r ) // never throws
     {
-        this_type( std::move( r ) ).swap( *this );
+        this_type( static_cast< shared_ptr && >( r ) ).swap( *this );
         return *this;
     }
 
     template<class Y>
     shared_ptr & operator=( shared_ptr<Y> && r ) // never throws
     {
-        this_type( std::move( r ) ).swap( *this );
+        this_type( static_cast< shared_ptr<Y> && >( r ) ).swap( *this );
         return *this;
     }
 
diff --git a/include/boost/smart_ptr/weak_ptr.hpp b/include/boost/smart_ptr/weak_ptr.hpp
index 621c433..8690cca 100644
--- a/include/boost/smart_ptr/weak_ptr.hpp
+++ b/include/boost/smart_ptr/weak_ptr.hpp
@@ -86,13 +86,13 @@ public:
     weak_ptr( weak_ptr<Y> && r )
 
 #endif
-    : px(r.lock().get()), pn(std::move(r.pn)) // never throws
+    : px( r.lock().get() ), pn( static_cast< boost::detail::weak_count && >( r.pn ) ) // never throws
     {
         r.px = 0;
     }
 
     // for better efficiency in the T == Y case
-    weak_ptr( weak_ptr && r ): px( r.px ), pn(std::move(r.pn)) // never throws
+    weak_ptr( weak_ptr && r ): px( r.px ), pn( static_cast< boost::detail::weak_count && >( r.pn ) ) // never throws
     {
         r.px = 0;
     }
@@ -100,7 +100,7 @@ public:
     // for better efficiency in the T == Y case
     weak_ptr & operator=( weak_ptr && r ) // never throws
     {
-        this_type( std::move( r ) ).swap( *this );
+        this_type( static_cast< weak_ptr && >( r ) ).swap( *this );
         return *this;
     }
 
@@ -134,9 +134,9 @@ public:
 #if defined( BOOST_HAS_RVALUE_REFS )
 
     template<class Y>
-    weak_ptr & operator=(weak_ptr<Y> && r)
+    weak_ptr & operator=( weak_ptr<Y> && r )
     {
-        this_type( std::move( r ) ).swap( *this );
+        this_type( static_cast< weak_ptr<Y> && >( r ) ).swap( *this );
         return *this;
     }