diff --git a/pngconf.h b/pngconf.h
index a41aadddc..023dd9b97 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -387,7 +387,7 @@
 #        ifndef PNG_RESTRICT
 #          define PNG_RESTRICT __restrict
 #        endif
-#      endif /*  __GNUC__ == 3.0 */
+#      endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */
 #    endif /*  __GNUC__ >= 3 */
 
 #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)