diff --git a/colourgo/game.s b/colourgo/game.s
index 94e2226..e3d88c8 100644
--- a/colourgo/game.s
+++ b/colourgo/game.s
@@ -569,6 +569,7 @@ lastButtonState: .BYTE $00
     bcs @overflow
     cmp gridXPos
     bcc @nextGrid
+    beq @nextGrid
 
 @overflow:
     sbc gridXPos