diff --git a/tools/testing/selftests/net/psock_fanout.c b/tools/testing/selftests/net/psock_fanout.c
index b4b1d91fcea5..989f917068d1 100644
--- a/tools/testing/selftests/net/psock_fanout.c
+++ b/tools/testing/selftests/net/psock_fanout.c
@@ -305,7 +305,7 @@ static void test_unique_fanout_group_ids(void)
 		exit(1);
 	}
 
-	if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id)) {
+	if (sock_fanout_open(PACKET_FANOUT_CPU, first_group_id) != -1) {
 		fprintf(stderr, "ERROR: joined group with wrong type.\n");
 		exit(1);
 	}