diff --git a/sourcemm/ISmmAPI.h b/sourcemm/ISmmAPI.h
index af45693..2656886 100644
--- a/sourcemm/ISmmAPI.h
+++ b/sourcemm/ISmmAPI.h
@@ -24,7 +24,7 @@
 
 #if defined __GNUC__
 #if ((__GNUC__ == 3) && (__GNUC_MINOR__ < 4)) || (__GNUC__ < 3)
-//#error "You must compile with at least GCC 3.4! If you know what you are doing, you can remove this message."
+#error "You must compile with at least GCC 3.4! If you know what you are doing, you can remove this message."
 #endif //version check
 #endif //__GNUC__