diff --git a/hardware/arduino/cores/arduino/USBAPI.h b/hardware/arduino/cores/arduino/USBAPI.h
index 73a90cedc..ae91a3613 100644
--- a/hardware/arduino/cores/arduino/USBAPI.h
+++ b/hardware/arduino/cores/arduino/USBAPI.h
@@ -44,8 +44,8 @@ extern Serial_ Serial;
 //	Mouse
 
 #define MOUSE_LEFT 1
-#define MOUSE_MIDDLE 2
-#define MOUSE_RIGHT 4
+#define MOUSE_RIGHT 2
+#define MOUSE_MIDDLE 4
 
 class Mouse_
 {