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-rw-r--r--util/show-contour.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/util/show-contour.c b/util/show-contour.c
index f3fa1babf..e09f6315f 100644
--- a/util/show-contour.c
+++ b/util/show-contour.c
@@ -1,4 +1,5 @@
-#define _GNU_SOURCE
+#include "config.h"
+
#include <gtk/gtk.h>
#include <stdlib.h>
#include <stdio.h>