diff --git a/include/boost/bind/bind.hpp b/include/boost/bind/bind.hpp
index bda1263..11fcb2a 100644
--- a/include/boost/bind/bind.hpp
+++ b/include/boost/bind/bind.hpp
@@ -172,7 +172,7 @@ public:
 
     list( A... a ): data_( a... ) {}
 
-#if BOOST_MSVC
+#if defined(BOOST_MSVC)
 # pragma warning( push )
 # pragma warning( disable: 4100 ) // unreferenced formal parameter 'a2'
 #endif
@@ -197,7 +197,7 @@ public:
         unwrapper<F>::unwrap( f, 0 )( a2[ std::get<I>( data_ ) ]... );
     }
 
-#if BOOST_MSVC
+#if defined(BOOST_MSVC)
 # pragma warning( pop )
 #endif
 
diff --git a/include/boost/bind/detail/tuple_for_each.hpp b/include/boost/bind/detail/tuple_for_each.hpp
index b1091ca..d1eabff 100644
--- a/include/boost/bind/detail/tuple_for_each.hpp
+++ b/include/boost/bind/detail/tuple_for_each.hpp
@@ -14,7 +14,7 @@
 #include <type_traits>
 #include <cstddef>
 
-#if BOOST_MSVC
+#if defined(BOOST_MSVC)
 # pragma warning( push )
 # pragma warning( disable: 4100 ) // unreferenced formal parameter 'tp'
 #endif
@@ -57,7 +57,7 @@ template<class F, class Tp1, class Tp2> F tuple_for_each( F&& f, Tp1&& tp1, Tp2&
 } // namespace _bi
 } // namespace boost
 
-#if BOOST_MSVC
+#if defined(BOOST_MSVC)
 # pragma warning( pop )
 #endif