diff --git a/src/emu/mame.c b/src/emu/mame.c
index a94c89bef3b..279e006b51a 100644
--- a/src/emu/mame.c
+++ b/src/emu/mame.c
@@ -114,7 +114,8 @@ machine_manager::machine_manager(emu_options &options,osd_interface &osd)
        : m_osd(osd),
 	   m_options(options),
 	   m_web(options),
-	   m_new_driver_pending(NULL)
+	   m_new_driver_pending(NULL),
+	   m_machine(NULL)
 {
 }