diff --git a/module/obmc/wsgi/apps/rest_dbus.py b/module/obmc/wsgi/apps/rest_dbus.py
index b1da97d..93f0895 100644
--- a/module/obmc/wsgi/apps/rest_dbus.py
+++ b/module/obmc/wsgi/apps/rest_dbus.py
@@ -96,6 +96,9 @@
         try:
             return f(**kw)
         except dbus.exceptions.DBusException, e:
+            if e.get_dbus_name() == \
+                    'org.freedesktop.DBus.Error.ObjectPathInUse':
+                abort(503, str(e))
             if e.get_dbus_name() != obmc.mapper.MAPPER_NOT_FOUND:
                 raise
             if callback is None: