diff --git a/src/mame/drivers/8080bw.c b/src/mame/drivers/8080bw.c
index d4a4ad8475d..c6f6b95ebb2 100644
--- a/src/mame/drivers/8080bw.c
+++ b/src/mame/drivers/8080bw.c
@@ -228,6 +228,7 @@ static MACHINE_DRIVER_START( invadpt2 )
     MDRV_IMPORT_FROM(mw8080bw_root)
     MDRV_CPU_MODIFY("main")
     MDRV_CPU_IO_MAP(invadpt2_io_map,0)
+    MDRV_WATCHDOG_VBLANK_INIT(255)
 
 	/* video hardware */
 	MDRV_VIDEO_UPDATE(invadpt2)