diff --git a/src/mame/drivers/strnskil.c b/src/mame/drivers/strnskil.c
index ba2781b9865..b4825b3b5b8 100644
--- a/src/mame/drivers/strnskil.c
+++ b/src/mame/drivers/strnskil.c
@@ -323,11 +323,11 @@ static MACHINE_CONFIG_START( strnskil, strnskil_state )
 	/* basic machine hardware */
 	MCFG_CPU_ADD("maincpu", Z80,8000000/2) /* 4.000MHz */
 	MCFG_CPU_PROGRAM_MAP(strnskil_map1)
-	MCFG_CPU_VBLANK_INT_HACK(irq0_line_hold,2*60)
+	MCFG_CPU_VBLANK_INT_HACK(irq0_line_hold,2)
 
 	MCFG_CPU_ADD("sub", Z80,8000000/2) /* 4.000MHz */
 	MCFG_CPU_PROGRAM_MAP(strnskil_map2)
-	MCFG_CPU_VBLANK_INT_HACK(irq0_line_hold,2*60)
+	MCFG_CPU_VBLANK_INT_HACK(irq0_line_hold,2)
 
 	MCFG_QUANTUM_TIME(attotime::from_hz(6000))