diff --git a/plat/arm/board/rdn1edge/include/platform_def.h b/plat/arm/board/rdn1edge/include/platform_def.h
index b167c46..a61b0d5 100644
--- a/plat/arm/board/rdn1edge/include/platform_def.h
+++ b/plat/arm/board/rdn1edge/include/platform_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,6 +9,7 @@
 
 #include <lib/utils_def.h>
 
+#include <sgi_sdei.h>
 #include <sgi_soc_platform_def.h>
 
 #define PLAT_ARM_CLUSTER_COUNT		U(2)