diff --git a/src/emu/mame.c b/src/emu/mame.c
index c36b6ea77cb..e7f56ce3e43 100644
--- a/src/emu/mame.c
+++ b/src/emu/mame.c
@@ -121,17 +121,6 @@ static output_delegate output_cb[OUTPUT_CHANNEL_COUNT] =
     CORE IMPLEMENTATION
 ***************************************************************************/
 
-/*-------------------------------------------------
-    mame_is_valid_machine - return true if the
-    given machine is valid
--------------------------------------------------*/
-
-int mame_is_valid_machine(running_machine &machine)
-{
-	return (&machine == global_machine);
-}
-
-
 /*-------------------------------------------------
     mame_execute - run the core emulation
 -------------------------------------------------*/
diff --git a/src/emu/mame.h b/src/emu/mame.h
index cdec7d1db1f..2be41e6c1db 100644
--- a/src/emu/mame.h
+++ b/src/emu/mame.h
@@ -96,9 +96,6 @@ extern const char build_version[];
 /* execute as configured by the OPTION_SYSTEMNAME option on the specified options */
 int mame_execute(emu_options &options, osd_interface &osd);
 
-/* return true if the given machine is valid */
-int mame_is_valid_machine(running_machine &machine);
-
 
 
 /* ----- output management ----- */