diff --git a/include/nana/c++defines.hpp b/include/nana/c++defines.hpp
index f7ac48e5..02970f53 100644
--- a/include/nana/c++defines.hpp
+++ b/include/nana/c++defines.hpp
@@ -135,7 +135,7 @@
 	#endif
 
 
-	#if ((__GNUC__ > 5)   )
+	#if ((__GNUC__ < 5)   )
 	#	defie STD_put_time_NOT_SUPPORTED
     #endif