diff --git a/src/mame/video/m72.c b/src/mame/video/m72.c
index 5811b61cbab..20e3d6616f7 100644
--- a/src/mame/video/m72.c
+++ b/src/mame/video/m72.c
@@ -128,11 +128,11 @@ VIDEO_START( m72 )
 
 	tilemap_set_transmask(fg_tilemap,0,0xffff,0x0001);
 	tilemap_set_transmask(fg_tilemap,1,0x00ff,0xff01);
-	tilemap_set_transmask(fg_tilemap,2,0x0001,0xffff);
+	tilemap_set_transmask(fg_tilemap,2,0xffff,0x0001);
 
 	tilemap_set_transmask(bg_tilemap,0,0xffff,0x0000);
 	tilemap_set_transmask(bg_tilemap,1,0x00ff,0xff00);
-	tilemap_set_transmask(bg_tilemap,2,0x0001,0xfffe);
+	tilemap_set_transmask(bg_tilemap,2,0xfffe,0x0001);
 
 	memset(m72_spriteram,0,spriteram_size);