diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 9ff2e9357e9a..aa1e791779b4 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * SCMI Message Protocol driver header
  *