diff --git a/src/mame/drivers/namcos22.c b/src/mame/drivers/namcos22.c
index 6ee720eeac4..dc5da04c4ec 100644
--- a/src/mame/drivers/namcos22.c
+++ b/src/mame/drivers/namcos22.c
@@ -2790,6 +2790,8 @@ static MACHINE_DRIVER_START( namcos22s )
 	MDRV_CPU_IO_MAP( mcu_io, 0 )
 	MDRV_CPU_VBLANK_INT_HACK(mcu_interrupt, 3)
 
+	MDRV_INTERLEAVE(100)
+
 	MDRV_NVRAM_HANDLER(namcos22)
 	MDRV_SCREEN_ADD("main", RASTER)
 	MDRV_SCREEN_REFRESH_RATE(60)