diff --git a/src/mame/drivers/tmnt.c b/src/mame/drivers/tmnt.c
index 0471184146b..55b83b16dad 100644
--- a/src/mame/drivers/tmnt.c
+++ b/src/mame/drivers/tmnt.c
@@ -4102,7 +4102,7 @@ GAME( 1989, tmntu,       tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,
 GAME( 1989, tmntua,      tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Ninja Turtles (US 4 Players, set 2)", GAME_SUPPORTS_SAVE )
 GAME( 1989, tmht,        tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Hero Turtles (UK 4 Players, set 1)", GAME_SUPPORTS_SAVE )
 GAME( 1989, tmhta,       tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Hero Turtles (UK 4 Players, set 2)", GAME_SUPPORTS_SAVE )
-GAME( 1989, tmhtb,       tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Hero Turtles (UK?, unknown revision)", GAME_SUPPORTS_SAVE ) // incomplete dump
+GAME( 1989, tmhtb,       tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Hero Turtles (UK?, unknown revision)", GAME_NOT_WORKING | GAME_SUPPORTS_SAVE ) // incomplete dump
 GAME( 1990, tmntj,       tmnt,     tmnt,     tmnt,      tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Ninja Turtles (Japan 4 Players)", GAME_SUPPORTS_SAVE )
 GAME( 1989, tmht2p,      tmnt,     tmnt,     tmnt2p,    tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Hero Turtles (UK 2 Players, set 1)", GAME_SUPPORTS_SAVE )
 GAME( 1989, tmht2pa,     tmnt,     tmnt,     tmnt2p,    tmnt_state,    tmnt,     ROT0,   "Konami", "Teenage Mutant Hero Turtles (UK 2 Players, set 2)", GAME_SUPPORTS_SAVE )