diff --git a/src/mame/drivers/cojag.c b/src/mame/drivers/cojag.c
index fb1c99f0579..036b3db1a5b 100644
--- a/src/mame/drivers/cojag.c
+++ b/src/mame/drivers/cojag.c
@@ -1197,10 +1197,10 @@ ROM_END
 
 ROM_START( area51a ) /* 68020 based, Area51 Atari Games License  Date: Oct 25, 1995 */
 	ROM_REGION32_BE( 0x200000, "user1", 0 )	/* 2MB for 68020 code */
-	ROM_LOAD32_BYTE( "3h", 0x00000, 0x80000, CRC(116d37e6) SHA1(5d36cae792dd349faa77cd2d8018722a28ee55c1) )
-	ROM_LOAD32_BYTE( "3p", 0x00001, 0x80000, CRC(eb10f539) SHA1(dadc4be5a442dd4bd17385033056555e528ed994) )
-	ROM_LOAD32_BYTE( "3m", 0x00002, 0x80000, CRC(c6d8322b) SHA1(90cf848a4195c51b505653cc2c74a3b9e3c851b8) )
-	ROM_LOAD32_BYTE( "3k", 0x00003, 0x80000, CRC(729eb1b7) SHA1(21864b4281b1ad17b2903e3aa294e4be74161e80) )
+	ROM_LOAD32_BYTE( "136105-0003a.3h", 0x00000, 0x80000, CRC(116d37e6) SHA1(5d36cae792dd349faa77cd2d8018722a28ee55c1) )
+	ROM_LOAD32_BYTE( "136105-0002a.3p", 0x00001, 0x80000, CRC(eb10f539) SHA1(dadc4be5a442dd4bd17385033056555e528ed994) )
+	ROM_LOAD32_BYTE( "136105-0001a.3m", 0x00002, 0x80000, CRC(c6d8322b) SHA1(90cf848a4195c51b505653cc2c74a3b9e3c851b8) )
+	ROM_LOAD32_BYTE( "136105-0000a.3k", 0x00003, 0x80000, CRC(729eb1b7) SHA1(21864b4281b1ad17b2903e3aa294e4be74161e80) )
 
 	DISK_REGION( "ide" )
 	DISK_IMAGE( "area51", 0, SHA1(3b303bc37e206a6d7339352c869f050d04186f11) )