diff --git a/arch/arm/dts/uniphier-ph1-pro4-ref.dts b/arch/arm/dts/uniphier-ph1-pro4-ref.dts
index f6d03e3..b4b7f61 100644
--- a/arch/arm/dts/uniphier-ph1-pro4-ref.dts
+++ b/arch/arm/dts/uniphier-ph1-pro4-ref.dts
@@ -5,7 +5,7 @@
  * Copyright (C) 2015      Socionext Inc.
  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
  *
- * SPDX-License-Identifier:	GPL-2.0+
+ * SPDX-License-Identifier:	GPL-2.0+	X11
  */
 
 /dts-v1/;