diff --git a/src/mame/drivers/namcos10.c b/src/mame/drivers/namcos10.c
index ff4d11af5fe..65b52ec6dc2 100644
--- a/src/mame/drivers/namcos10.c
+++ b/src/mame/drivers/namcos10.c
@@ -377,7 +377,7 @@ static MACHINE_RESET( namcos10 )
 
 static MACHINE_DRIVER_START( namcos10 )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, XTAL_100MHz / 2 )
+	MDRV_CPU_ADD( PSXCPU, XTAL_101_4912MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( namcos10_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )