diff --git a/package/libs/libnl-tiny/src/include/netlink-local.h b/package/libs/libnl-tiny/src/include/netlink-local.h
index 330100e805..53da8ca97e 100644
--- a/package/libs/libnl-tiny/src/include/netlink-local.h
+++ b/package/libs/libnl-tiny/src/include/netlink-local.h
@@ -11,7 +11,9 @@
 
 #ifndef NETLINK_LOCAL_H_
 #define NETLINK_LOCAL_H_
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 
 #include <stdio.h>
 #include <errno.h>