diff --git a/samples/bpf/cookie_uid_helper_example.c b/samples/bpf/cookie_uid_helper_example.c
index ad5afedf2e7047db24db8565e0a433122e479912..9ce55840d61d222ec2c9881be9a108c7b630dba0 100644
--- a/samples/bpf/cookie_uid_helper_example.c
+++ b/samples/bpf/cookie_uid_helper_example.c
@@ -273,7 +273,7 @@ static int usage(void)
 	return 1;
 }
 
-void finish(int ret)
+static void finish(int ret)
 {
 	test_finish = true;
 }