diff --git a/include/lib/utils_def.h b/include/lib/utils_def.h
index 09ae399..2d0e9c0 100644
--- a/include/lib/utils_def.h
+++ b/include/lib/utils_def.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2020, ARM Limited and Contributors. All rights reserved.
  * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
@@ -17,7 +17,7 @@
 #define IS_POWER_OF_TWO(x)			\
 	(((x) & ((x) - 1)) == 0)
 
-#define SIZE_FROM_LOG2_WORDS(n)		(4 << (n))
+#define SIZE_FROM_LOG2_WORDS(n)		(U(4) << (n))
 
 #define BIT_32(nr)			(U(1) << (nr))
 #define BIT_64(nr)			(ULL(1) << (nr))