diff --git a/src/constant.h b/src/constant.h
index edbf690..76d2253 100644
--- a/src/constant.h
+++ b/src/constant.h
@@ -17,7 +17,7 @@
 #define JOYMIN -32767
 
 //maximum number of defined keys
-#define MAXKEY 122
+#define MAXKEY 123
 
 //fastest the mouse can go. Completely arbitrary.
 #define MAXMOUSESPEED 5000