diff --git a/include/boost/exception/exception.hpp b/include/boost/exception/exception.hpp
index 1aa6718..be70b3c 100644
--- a/include/boost/exception/exception.hpp
+++ b/include/boost/exception/exception.hpp
@@ -16,7 +16,7 @@ namespace boost { template <class T> class shared_ptr; }
 namespace boost { namespace exception_detail { using boost::shared_ptr; } }
 #endif
 
-#if (__GNUC__*100+__GNUC_MINOR__>301) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
+#if defined(__GNUC__) && (__GNUC__*100+__GNUC_MINOR__>301) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
 #pragma GCC system_header
 #endif
 #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
diff --git a/include/boost/throw_exception.hpp b/include/boost/throw_exception.hpp
index 74ab0fb..a96dded 100644
--- a/include/boost/throw_exception.hpp
+++ b/include/boost/throw_exception.hpp
@@ -43,7 +43,7 @@
 # define BOOST_THROW_EXCEPTION(x) ::boost::throw_exception(x)
 #endif
 
-#if (__GNUC__*100+__GNUC_MINOR__>301) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
+#if defined(__GNUC__) && (__GNUC__*100+__GNUC_MINOR__>301) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)
 #pragma GCC system_header
 #endif
 #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)