diff --git a/targets/arduino/WProgram.h b/targets/arduino/WProgram.h
index 4ca4ab0d8..d3688ddce 100755
--- a/targets/arduino/WProgram.h
+++ b/targets/arduino/WProgram.h
@@ -1,7 +1,9 @@
-#include <avr/io.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <avr/interrupt.h>
+#include <avr/signal.h>
 
 #include "wiring.h"
 #include "HardwareSerial.h"
 
-#include <avr/interrupt.h>
-#include <avr/signal.h>
diff --git a/targets/arduino/wiring.h b/targets/arduino/wiring.h
index 2b55c4d4c..e90cb9fd5 100755
--- a/targets/arduino/wiring.h
+++ b/targets/arduino/wiring.h
@@ -25,6 +25,8 @@
 #ifndef Wiring_h
 #define Wiring_h
 
+#include <avr/io.h>
+
 #ifdef __cplusplus
 extern "C"{
 #endif