diff --git a/src/mame/drivers/galdrvr.c b/src/mame/drivers/galdrvr.c
index bce45c20cf1..877698e5bc8 100644
--- a/src/mame/drivers/galdrvr.c
+++ b/src/mame/drivers/galdrvr.c
@@ -2768,7 +2768,7 @@ ROM_START( omega )
 	ROM_LOAD( "omega1k.bin",  0x0800, 0x0800, CRC(36de42c6) SHA1(6fd93d439e3b8eab62049f925d9e8f8deeda2ae3) )
 
 	ROM_REGION( 0x0020, "proms", 0 )
-	ROM_LOAD( "6331-1j.86",   0x0000, 0x0020, NO_DUMP )	/* missing */
+	ROM_LOAD( "mmi6331-1j.86",   0x0000, 0x0020, CRC(6a0c7d87) SHA1(140335d85c67c75b65689d4e76d29863c209cf32) )
 ROM_END