diff --git a/glib/gmacros.h b/glib/gmacros.h
index b0384ccf0..1fe6e760c 100644
--- a/glib/gmacros.h
+++ b/glib/gmacros.h
@@ -304,10 +304,10 @@
 #endif
 
 /* Provide a string identifying the current function, non-concatenatable */
-#if defined (__func__)
-#define G_STRFUNC     ((const char*) (__func__))
-#elif defined (__GNUC__) && defined (__cplusplus)
+#if defined (__GNUC__) && defined (__cplusplus)
 #define G_STRFUNC     ((const char*) (__PRETTY_FUNCTION__))
+#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__))
 #else