diff --git a/drivers/visorbus/controlvmchannel.h b/drivers/visorbus/controlvmchannel.h
index 8c57562a070a..c87213554427 100644
--- a/drivers/visorbus/controlvmchannel.h
+++ b/drivers/visorbus/controlvmchannel.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2010 - 2015 UNISYS CORPORATION
  * All rights reserved.
diff --git a/drivers/visorbus/vbuschannel.h b/drivers/visorbus/vbuschannel.h
index b1dce26166bf..4aaf6564eb9f 100644
--- a/drivers/visorbus/vbuschannel.h
+++ b/drivers/visorbus/vbuschannel.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2010 - 2015 UNISYS CORPORATION
  * All rights reserved.
diff --git a/drivers/visorbus/visorbus_private.h b/drivers/visorbus/visorbus_private.h
index 366380b7f8d9..6956de605827 100644
--- a/drivers/visorbus/visorbus_private.h
+++ b/drivers/visorbus/visorbus_private.h
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2010 - 2015 UNISYS CORPORATION
  * All rights reserved.