diff --git a/lib/base/i2-base.hpp b/lib/base/i2-base.hpp
index 06642709c..b837122ce 100644
--- a/lib/base/i2-base.hpp
+++ b/lib/base/i2-base.hpp
@@ -56,12 +56,12 @@
 #	pragma warning(disable:4251)
 #	pragma warning(disable:4275)
 #	pragma warning(disable:4345)
+#else /* _MSC_VER */
+#	ifndef NDEBUG
+#		define _DEBUG
+#	endif /* NDEBUG */
 #endif /* _MSC_VER */
 
-#ifndef NDEBUG
-#	define _DEBUG
-#endif /* NDEBUG */
-
 #include "config.h"
 
 #ifdef _WIN32