diff --git a/src/mame/drivers/cyclemb.c b/src/mame/drivers/cyclemb.c
index 1e861f4447d..4b3191f442a 100644
--- a/src/mame/drivers/cyclemb.c
+++ b/src/mame/drivers/cyclemb.c
@@ -835,7 +835,7 @@ ROM_START( skydest )
     ROM_LOAD( "pd0-15.10c",   0x000000, 0x002000, CRC(f8b3d3f7) SHA1(447907f982362f5995d7eb646628cf0e07ba8f64) )
     ROM_LOAD( "pd0-16.10d",   0x002000, 0x002000, CRC(19ce8106) SHA1(31186d3b1c0d124da82310930a002a481941ebb1) )
 
-	ROM_REGION( 0x4000, "tilemap_data", 0 )
+	ROM_REGION( 0x4000, "tilemap_data", ROMREGION_INVERT )
     ROM_LOAD( "pd0-20.1h",    0x000000, 0x004000, CRC(8b2137f2) SHA1(1f83e081cab116c69a8349fd33ba1916b1c91826) )
 
 	ROM_REGION( 0x10000, "sprite_data_1", ROMREGION_ERASEFF )