diff --git a/src/sig_stfl/xmss/CMakeLists.txt b/src/sig_stfl/xmss/CMakeLists.txt
index e1d287472f..dc57732e16 100644
--- a/src/sig_stfl/xmss/CMakeLists.txt
+++ b/src/sig_stfl/xmss/CMakeLists.txt
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: MIT
+# SPDX-License-Identifier: Apache-2.0 AND MIT
 
 set(_XMSS_OBJS "")