diff --git a/src/mame/drivers/amaticmg.c b/src/mame/drivers/amaticmg.c
index 32f3bcfe190..3f33222cc14 100644
--- a/src/mame/drivers/amaticmg.c
+++ b/src/mame/drivers/amaticmg.c
@@ -744,7 +744,7 @@ ROM_START( am_mg24 )
 	ROM_LOAD( "multi_2.4_zg2.i18.bin", 0x080000, 0x80000, CRC(b504e1b8) SHA1(ffa17a2c212eb2fffb89b131868e69430cb41203) )
 	ROM_LOAD( "multi_2.4_zg3.i33.bin", 0x100000, 0x80000, CRC(9b66bb4d) SHA1(64035d2028a9b68164c87475a1ec9754453ad572) )
 
-	ROM_REGION( 0x0400, "proms", 0 )
+	ROM_REGION( 0x20000/*0x0400*/, "proms", 0 )
 	ROM_LOAD( "n82s147a_1.bin", 0x0000, 0x0200, NO_DUMP )
 	ROM_LOAD( "n82s147a_2.bin", 0x0200, 0x0200, NO_DUMP )
 ROM_END