diff --git a/lib/stdlib/abort.c b/lib/stdlib/abort.c
index af19ccf..65ce4cc 100644
--- a/lib/stdlib/abort.c
+++ b/lib/stdlib/abort.c
@@ -1,10 +1,11 @@
 /*
- * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <debug.h>
+#include <stdlib.h>
 
 /*
  * This is a basic implementation. This could be improved.
diff --git a/lib/stdlib/exit.c b/lib/stdlib/exit.c
index 3d23d7b..afc3f93 100644
--- a/lib/stdlib/exit.c
+++ b/lib/stdlib/exit.c
@@ -1,10 +1,11 @@
 /*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #include <debug.h>
+#include <stdlib.h>
 
 void exit(int v)
 {
diff --git a/lib/stdlib/sscanf.c b/lib/stdlib/sscanf.c
index 674ae79..a5876cf 100644
--- a/lib/stdlib/sscanf.c
+++ b/lib/stdlib/sscanf.c
@@ -1,9 +1,10 @@
 /*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
+#include <stdio.h>
 #include <sys/cdefs.h>
 
 /*