--- dbus-1.8.20.old/tools/dbus-launch.c
+++ dbus-1.8.20/tools/dbus-launch.c
@@ -993,6 +993,11 @@
   if (exit_with_session)
     verbose ("--exit-with-session enabled\n");
 
+  if (config_file == NULL)
+  {
+      config_file = xstrdup ("__META_PREFIX__/etc/dbus-1/session.conf");
+  }
+
   if (autolaunch)
     {      
 #ifndef DBUS_BUILD_X11