diff --git a/src/mame/drivers/tmnt.c b/src/mame/drivers/tmnt.c
index b90790345eb..07b4b8b563a 100644
--- a/src/mame/drivers/tmnt.c
+++ b/src/mame/drivers/tmnt.c
@@ -2084,7 +2084,7 @@ static MACHINE_CONFIG_START( tmnt, tmnt_state )
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500) /* not accurate */)
 	MCFG_SCREEN_SIZE(64*8, 32*8)
 	//MCFG_SCREEN_VISIBLE_AREA(13*8, (64-13)*8-1, 2*8, 30*8-1 )
-	MCFG_SCREEN_VISIBLE_AREA(13*8-8, (64-13)*8-1+8, 2*8, 30*8-1 )
+	MCFG_SCREEN_VISIBLE_AREA(12*8, (64-12)*8-1, 2*8, 30*8-1 )
 	MCFG_SCREEN_UPDATE_DRIVER(tmnt_state, screen_update_tmnt)
 	MCFG_SCREEN_PALETTE("palette")
 	// We see something strange in the left 8 pixels and the right 8 pixels, but it is same as real PCB.