diff --git a/glib/gmacros.h b/glib/gmacros.h
index f3f542bd9..8a36671a4 100644
--- a/glib/gmacros.h
+++ b/glib/gmacros.h
@@ -195,7 +195,7 @@
 /* Provide a string identifying the current function, non-concatenatable */
 #if defined (__GNUC__) && defined (__cplusplus)
 #  define G_STRFUNC     ((const char*) (__PRETTY_FUNCTION__))
-#elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 19901L
+#elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 #  define G_STRFUNC     ((const char*) (__func__))
 #elif defined (__GNUC__) || (defined(_MSC_VER) && (_MSC_VER > 1300))
 #  define G_STRFUNC     ((const char*) (__FUNCTION__))