diff --git a/src/mame/drivers/astrocde.cpp b/src/mame/drivers/astrocde.cpp
index 62545270da2..864c8bd14ad 100644
--- a/src/mame/drivers/astrocde.cpp
+++ b/src/mame/drivers/astrocde.cpp
@@ -1800,13 +1800,13 @@ GAMEL(1980, ebases,   0,    ebases,   ebases, astrocde_state,   ebases,   ROT0,
 GAMEL(1980, spacezap, 0,    spacezap, spacezap, astrocde_state, spacezap, ROT0,   "Midway", "Space Zap", MACHINE_SUPPORTS_SAVE, layout_spacezap )
 
 /* 91354 CPU board + 90708 game board + 91356 RAM board + 91355 pattern board + 91397 memory board */
-GAME( 1980, wow,      0,    wow,      wow, astrocde_state,      wow,      ROT0,   "Dave Nutting Associates / Midway", "Wizard of Wor", MACHINE_SUPPORTS_SAVE )
-GAME( 1980, wowg,     wow,  wow,      wowg, astrocde_state,     wow,      ROT0,   "Dave Nutting Associates / Midway", "Wizard of Wor (with German Language ROM)", MACHINE_SUPPORTS_SAVE )
+GAME( 1980, wow,      0,    wow,      wow, astrocde_state,      wow,      ROT0,   "Dave Nutting Associates / Midway", "Wizard of Wor", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
+GAME( 1980, wowg,     wow,  wow,      wowg, astrocde_state,     wow,      ROT0,   "Dave Nutting Associates / Midway", "Wizard of Wor (with German Language ROM)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )
 
 /* 91354 CPU board + 90708 game board + 91356 RAM board + 91355 pattern board + 91364 ROM/RAM board */
-GAMEL(1981, gorf,     0,    gorf,     gorf, astrocde_state,     gorf,     ROT270, "Dave Nutting Associates / Midway", "Gorf", MACHINE_SUPPORTS_SAVE, layout_gorf  )
-GAMEL(1981, gorfpgm1, gorf, gorf,     gorf, astrocde_state,     gorf,     ROT270, "Dave Nutting Associates / Midway", "Gorf (program 1)", MACHINE_SUPPORTS_SAVE, layout_gorf )
-GAMEL(1981, gorfpgm1g,gorf, gorf,     gorfpgm1g, astrocde_state,gorf,     ROT270, "Dave Nutting Associates / Midway", "Gorf (program 1, with German Language ROM)", MACHINE_SUPPORTS_SAVE, layout_gorf )
+GAMEL(1981, gorf,     0,    gorf,     gorf, astrocde_state,     gorf,     ROT270, "Dave Nutting Associates / Midway", "Gorf", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE, layout_gorf  )
+GAMEL(1981, gorfpgm1, gorf, gorf,     gorf, astrocde_state,     gorf,     ROT270, "Dave Nutting Associates / Midway", "Gorf (program 1)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE, layout_gorf )
+GAMEL(1981, gorfpgm1g,gorf, gorf,     gorfpgm1g, astrocde_state,gorf,     ROT270, "Dave Nutting Associates / Midway", "Gorf (program 1, with German Language ROM)", MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE, layout_gorf )
 
 /* 91354 CPU board + 90708 game board + 91356 RAM board + 91355 pattern board + 91423 memory board */
 GAME( 1981, robby,    0,    robby,    robby, astrocde_state,    robby,    ROT0,   "Dave Nutting Associates / Bally Midway", "The Adventures of Robby Roto!", MACHINE_SUPPORTS_SAVE )