--- a/tools/run_test_env.sh
+++ b/tools/run_test_env.sh
@@ -33,7 +33,7 @@ if [ -n "${UI_TEST}" ]; then
     OPT="--auto-servernum"
   fi
   xvfb-run $OPT --server-args="-screen 0 1280x1024x24" \
-    dbus-run-session -- "$@"
+    dbus-run-session --config-file="@session_conf@" -- "$@"
 
 else
   # Run the executable directly,