diff --git a/app/dts/behaviors/backspace_delete.dtsi b/app/dts/behaviors/backspace_delete.dtsi
index 032055a2..aee74930 100644
--- a/app/dts/behaviors/backspace_delete.dtsi
+++ b/app/dts/behaviors/backspace_delete.dtsi
@@ -1,3 +1,11 @@
+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <dt-bindings/zmk/keys.h>
+
 / {
     behaviors {
         bdel: delete_backspace {