diff --git a/src/mame/drivers/tubep.cpp b/src/mame/drivers/tubep.cpp
index 67f9614dee6..59378d006d5 100644
--- a/src/mame/drivers/tubep.cpp
+++ b/src/mame/drivers/tubep.cpp
@@ -1142,6 +1142,6 @@ ROM_END
  *************************************/
 
 //    year  rom      parent  machine  inp      state        init
-GAME( 1984, tubep,   0,      tubep,   tubep,   tubep_state, empty_init, ROT0, "Nichibutsu / Fujitek", "Tube Panic",           MACHINE_SUPPORTS_SAVE )
-GAME( 1984, tubepb,  tubep,  tubepb,  tubepb,  tubep_state, empty_init, ROT0, "bootleg",              "Tube Panic (bootleg)", MACHINE_SUPPORTS_SAVE )
-GAME( 1984, rjammer, 0,      rjammer, rjammer, tubep_state, empty_init, ROT0, "Nichibutsu / Alice",   "Roller Jammer",        MACHINE_SUPPORTS_SAVE )
+GAME( 1984, tubep,   0,      tubep,   tubep,   tubep_state, empty_init, ROT0, "Nichibutsu / Fujitek", "Tube Panic",           MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_SOUND )
+GAME( 1984, tubepb,  tubep,  tubepb,  tubepb,  tubep_state, empty_init, ROT0, "bootleg",              "Tube Panic (bootleg)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_SOUND )
+GAME( 1984, rjammer, 0,      rjammer, rjammer, tubep_state, empty_init, ROT0, "Nichibutsu / Alice",   "Roller Jammer",        MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_SOUND )