diff --git a/ArmPkg/Library/ArmSoftFloatLib/platform.h b/ArmPkg/Library/ArmSoftFloatLib/platform.h
index 07800a9d5b..fddf9de04d 100644
--- a/ArmPkg/Library/ArmSoftFloatLib/platform.h
+++ b/ArmPkg/Library/ArmSoftFloatLib/platform.h
@@ -1,11 +1,17 @@
 /*
  * Copyright (c) 2019, Linaro Limited
+ * Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
  *
  * SPDX-License-Identifier: BSD-2-Clause-Patent
  */
 
+#ifndef ARM_SOFT_FLOAT_LIB_H_
+#define ARM_SOFT_FLOAT_LIB_H_
+
 #define LITTLEENDIAN 1
 #define INLINE static inline
 #define SOFTFLOAT_BUILTIN_CLZ 1
 #define SOFTFLOAT_FAST_INT64
 #include "opts-GCC.h"
+
+#endif // ARM_SOFT_FLOAT_LIB_H_