diff --git a/package/libnl-tiny/src/unl.c b/package/libnl-tiny/src/unl.c
index a60ba08292..4eb7dc07fd 100644
--- a/package/libnl-tiny/src/unl.c
+++ b/package/libnl-tiny/src/unl.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <netlink/netlink.h>
 #include <netlink/genl/genl.h>
 #include <netlink/genl/ctrl.h>