diff --git a/scrapy/tests/mockserver.py b/scrapy/tests/mockserver.py
index d5ff56605..785f3ea27 100644
--- a/scrapy/tests/mockserver.py
+++ b/scrapy/tests/mockserver.py
@@ -80,7 +80,7 @@ class Root(Resource):
 if __name__ == "__main__":
     root = Root()
     factory = Site(root)
-    port = reactor.listenTCP(8998, factory, interface="127.0.0.1")
+    port = reactor.listenTCP(8998, factory)
     def print_listening():
         h = port.getHost()
         print "Mock server running at http://%s:%d" % (h.host, h.port)