diff --git a/tests/test_seq.c b/tests/test_seq.c
index 13c5cb9..1fc5b8f 100644
--- a/tests/test_seq.c
+++ b/tests/test_seq.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later */
 
 #include <assert.h>
 #include <stdlib.h>