diff --git a/src/mame/drivers/gb.cpp b/src/mame/drivers/gb.cpp
index 50f23ee8211..f7e21388537 100644
--- a/src/mame/drivers/gb.cpp
+++ b/src/mame/drivers/gb.cpp
@@ -865,11 +865,11 @@ ROM_START(megaduck)
 ROM_END
 
 /*   YEAR  NAME      PARENT   COMPAT   MACHINE   INPUT    INIT  COMPANY     FULLNAME */
-CONS(1990, gameboy,  0,       0,       gameboy,  gameboy, driver_device, 0,    "Nintendo", "Game Boy", MACHINE_SUPPORTS_SAVE)
-CONS(1994, supergb,  gameboy, 0,       supergb,  gameboy, driver_device, 0,    "Nintendo", "Super Game Boy", MACHINE_SUPPORTS_SAVE)
-CONS(1998, supergb2, gameboy, 0,       supergb2, gameboy, driver_device, 0,    "Nintendo", "Super Game Boy 2", MACHINE_SUPPORTS_SAVE)
-CONS(1996, gbpocket, gameboy, 0,       gbpocket, gameboy, driver_device, 0,    "Nintendo", "Game Boy Pocket", MACHINE_SUPPORTS_SAVE)
-CONS(1998, gbcolor,  0,       0,       gbcolor,  gameboy, driver_device, 0,    "Nintendo", "Game Boy Color", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE)
+CONS(1990, gameboy,  0,       0,       gameboy,  gameboy, driver_device, 0,    "Nintendo", "Game Boy", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
+CONS(1994, supergb,  gameboy, 0,       supergb,  gameboy, driver_device, 0,    "Nintendo", "Super Game Boy", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
+CONS(1998, supergb2, gameboy, 0,       supergb2, gameboy, driver_device, 0,    "Nintendo", "Super Game Boy 2", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
+CONS(1996, gbpocket, gameboy, 0,       gbpocket, gameboy, driver_device, 0,    "Nintendo", "Game Boy Pocket", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE)
+CONS(1998, gbcolor,  0,       0,       gbcolor,  gameboy, driver_device, 0,    "Nintendo", "Game Boy Color", MACHINE_IMPERFECT_SOUND | MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE)
 
 // Sound is not 100% yet, it generates some sounds which could be ok. Since we're lacking a real system there's no way to verify.
 CONS( 1993, megaduck, 0,       0,       megaduck, gameboy, driver_device, 0,    "Welback Holdings (Timlex International) / Creatronic / Videojet / Cougar USA", "Mega Duck / Cougar Boy", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )