diff --git a/src/mame/drivers/namcofl.c b/src/mame/drivers/namcofl.c
index 5e976d8c2b7..ea2d525d5aa 100644
--- a/src/mame/drivers/namcofl.c
+++ b/src/mame/drivers/namcofl.c
@@ -395,7 +395,7 @@ static MACHINE_DRIVER_START( namcofl )
 
 	MDRV_SCREEN_ADD("screen", RASTER)
 	MDRV_SCREEN_REFRESH_RATE(60)
-	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_RGB32)
+	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
 	MDRV_SCREEN_SIZE(NAMCONB1_HTOTAL, NAMCONB1_VTOTAL)
 	MDRV_SCREEN_VISIBLE_AREA(0, NAMCONB1_HBSTART-1, 0, NAMCONB1_VBSTART-1)