diff --git a/src/mame/drivers/toaplan2.cpp b/src/mame/drivers/toaplan2.cpp
index cf95ac61c69..a5dd737a7db 100644
--- a/src/mame/drivers/toaplan2.cpp
+++ b/src/mame/drivers/toaplan2.cpp
@@ -3282,7 +3282,7 @@ static MACHINE_CONFIG_START( ghox )
 	MCFG_PALETTE_ADD("palette", T2PALETTE_LENGTH)
 	MCFG_PALETTE_FORMAT(xBBBBBGGGGGRRRRR)
 
-	MCFG_DEVICE_ADD("gp9001", GP9001_VDP, 0)
+	MCFG_DEVICE_ADD("gp9001", GP9001_VDP, XTAL_27MHz)
 	MCFG_GFX_PALETTE("palette")
 	MCFG_GP9001_VINT_CALLBACK(INPUTLINE("maincpu", M68K_IRQ_4))