diff --git a/src/mame/drivers/hshavoc.cpp b/src/mame/drivers/hshavoc.cpp
index 1a47aa2e568..ba31eb3e063 100644
--- a/src/mame/drivers/hshavoc.cpp
+++ b/src/mame/drivers/hshavoc.cpp
@@ -98,7 +98,7 @@ INPUT_PORTS_END
 
 
 ROM_START( hshavoc )
-	ROM_REGION( 0x100000, "maincpu", 0 )
+	ROM_REGION( 0x200000, "maincpu", 0 )
 	ROM_LOAD16_BYTE( "d-25.11a", 0x000000, 0x080000, CRC(6a155060) SHA1(ecb47bd428786e50e300a062b5038f943419a389) )
 	ROM_LOAD16_BYTE( "d-26.9a",  0x000001, 0x080000, CRC(1afa84fe) SHA1(041296e0360b7747aedc2d948c39e06ba03a7d08) )