diff --git a/src/mame/drivers/plygonet.c b/src/mame/drivers/plygonet.c
index 05631aa97ac..6510682fd6c 100644
--- a/src/mame/drivers/plygonet.c
+++ b/src/mame/drivers/plygonet.c
@@ -723,10 +723,10 @@ static DRIVER_INIT(polygonet)
 ROM_START( plygonet )
 	/* main program */
 	ROM_REGION( 0x200000, "maincpu", 0)
-	ROM_LOAD32_BYTE( "305a01.4k", 0x000003, 512*1024, CRC(8bdb6c95) SHA1(e981833842f8fd89b9726901fbe2058444204792) )
-	ROM_LOAD32_BYTE( "305a02.2k", 0x000002, 512*1024, CRC(4d7e32b3) SHA1(25731526535036972577637d186f02ae467296bd) )
-	ROM_LOAD32_BYTE( "305a03.2h", 0x000001, 512*1024, CRC(36e4e3fe) SHA1(e8fcad4f196c9b225a0fbe70791493ff07c648a9) )
-	ROM_LOAD32_BYTE( "305a04.4h", 0x000000, 512*1024, CRC(d8394e72) SHA1(eb6bcf8aedb9ba5843204ab8aacb735cbaafb74d) )
+	ROM_LOAD32_BYTE( "305uaa01.4k", 0x000003, 512*1024, CRC(8bdb6c95) SHA1(e981833842f8fd89b9726901fbe2058444204792) )
+	ROM_LOAD32_BYTE( "305uaa02.2k", 0x000002, 512*1024, CRC(4d7e32b3) SHA1(25731526535036972577637d186f02ae467296bd) )
+	ROM_LOAD32_BYTE( "305uaa03.2h", 0x000001, 512*1024, CRC(36e4e3fe) SHA1(e8fcad4f196c9b225a0fbe70791493ff07c648a9) )
+	ROM_LOAD32_BYTE( "305uaa04.4h", 0x000000, 512*1024, CRC(d8394e72) SHA1(eb6bcf8aedb9ba5843204ab8aacb735cbaafb74d) )
 
 	/* Z80 sound program */
 	ROM_REGION( 0x30000, "soundcpu", 0 )