diff --git a/tools/testing/selftests/bpf/prog_tests/cgroup_mprog_ordering.c b/tools/testing/selftests/bpf/prog_tests/cgroup_mprog_ordering.c
index 4a4e9710b474..a36d2e968bc5 100644
--- a/tools/testing/selftests/bpf/prog_tests/cgroup_mprog_ordering.c
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_mprog_ordering.c
@@ -12,7 +12,7 @@ static int run_getsockopt_test(int cg_parent, int sock_fd, bool has_relative_fd)
 	struct cgroup_preorder *skel = NULL;
 	struct bpf_program *prog;
 	__u8 *result, buf;
-	socklen_t optlen;
+	socklen_t optlen = 1;
 	int err = 0;
 
 	skel = cgroup_preorder__open_and_load();