diff --git a/lib/libc/memcmp.c b/lib/libc/memcmp.c
index a4c798b..cd5f0df 100644
--- a/lib/libc/memcmp.c
+++ b/lib/libc/memcmp.c
@@ -1,10 +1,11 @@
 /*
- * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <stddef.h>
+#include <string.h>
 
 int memcmp(const void *s1, const void *s2, size_t len)
 {