diff --git a/programs/games/rsquare/trunk/rsquare.asm b/programs/games/rsquare/trunk/rsquare.asm
index e4c9603796..65693ba39d 100644
--- a/programs/games/rsquare/trunk/rsquare.asm
+++ b/programs/games/rsquare/trunk/rsquare.asm
@@ -120,6 +120,7 @@ still:
 key:
 ;    mov  [event],al
     mcall 2
+	and  eax, 0xffff
     cmp  ah,13
     je   button.mode
     cmp  ah,27