diff --git a/include/boost/exception/exception.hpp b/include/boost/exception/exception.hpp
index c0fdaf9..d24845f 100644
--- a/include/boost/exception/exception.hpp
+++ b/include/boost/exception/exception.hpp
@@ -5,7 +5,7 @@
 
 #ifndef UUID_274DA366004E11DCB1DDFE2E56D89593
 #define UUID_274DA366004E11DCB1DDFE2E56D89593
-#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)