diff --git a/hardware/cores/arduino/wiring.h b/hardware/cores/arduino/wiring.h
index f0ba04c5b..df7c314f9 100755
--- a/hardware/cores/arduino/wiring.h
+++ b/hardware/cores/arduino/wiring.h
@@ -33,7 +33,7 @@ extern "C"{
 #endif
 
 #ifndef ARDUINO
-#define ARDUINO 16
+#define ARDUINO 18
 #endif
 
 #define HIGH 0x1