diff --git a/tests/sys/kern/socket_msg_waitall.c b/tests/sys/kern/socket_msg_waitall.c
index e9018b47eec..e1e10a4c788 100644
--- a/tests/sys/kern/socket_msg_waitall.c
+++ b/tests/sys/kern/socket_msg_waitall.c
@@ -54,6 +54,7 @@ close_test_client(void *arg)
 
 		ATF_REQUIRE(close(s) == 0);
 	}
+	free(buf);
 
 	return (NULL);
 }