diff --git a/platform/SingletonPtr.h b/platform/SingletonPtr.h
index 595d9807ca..81791ca93f 100644
--- a/platform/SingletonPtr.h
+++ b/platform/SingletonPtr.h
@@ -23,6 +23,7 @@
 #ifndef SINGLETONPTR_H
 #define SINGLETONPTR_H
 
+#include <stdlib.h>
 #include <stdint.h>
 #include <new>
 #include "platform/mbed_assert.h"