diff --git a/hardware/arduino/sam/cores/arduino/IPAddress.h b/hardware/arduino/sam/cores/arduino/IPAddress.h
index 622efb760..6ea81273c 100644
--- a/hardware/arduino/sam/cores/arduino/IPAddress.h
+++ b/hardware/arduino/sam/cores/arduino/IPAddress.h
@@ -20,6 +20,7 @@
 #ifndef IPAddress_h
 #define IPAddress_h
 
+#include <stdint.h>
 #include <Printable.h>
 
 // A class to make it easier to handle and pass around IP addresses