diff --git a/src/mame/drivers/simpsons.c b/src/mame/drivers/simpsons.c
index 62ddd45317d..c85219bb1db 100644
--- a/src/mame/drivers/simpsons.c
+++ b/src/mame/drivers/simpsons.c
@@ -328,7 +328,7 @@ static MACHINE_DRIVER_START( simpsons )
 	MDRV_VIDEO_ATTRIBUTES(VIDEO_HAS_SHADOWS | VIDEO_HAS_HIGHLIGHTS | VIDEO_UPDATE_AFTER_VBLANK)
 
 	MDRV_SCREEN_ADD("screen", RASTER)
-	MDRV_SCREEN_REFRESH_RATE(60)
+	MDRV_SCREEN_REFRESH_RATE(59.1856)
 	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500) /* not accurate */)
 	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
 	MDRV_SCREEN_SIZE(64*8, 32*8)