diff --git a/nat64-bpf/nat64_kern.c b/nat64-bpf/nat64_kern.c
index 335b88e..a4cb171 100644
--- a/nat64-bpf/nat64_kern.c
+++ b/nat64-bpf/nat64_kern.c
@@ -10,6 +10,8 @@
 #include "../include/xdp/parsing_helpers.h"
 #include "nat64.h"
 
+char _license[] SEC("license") = "GPL";
+
 struct nat64_config config;
 
 struct {