diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
index d42d534a66cd7006a38e113b4b5b8e30359e7a76..a9bc5334a478d6774d1409a837665b4f143d8597 100644
--- a/scripts/kconfig/nconf.c
+++ b/scripts/kconfig/nconf.c
@@ -5,7 +5,9 @@
  * Derived from menuconfig.
  *
  */
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <string.h>
 #include <stdlib.h>