diff --git a/src/allmydata/test/test_node.py b/src/allmydata/test/test_node.py
index 24ec571..f3d9f6c 100644
--- a/src/allmydata/test/test_node.py
+++ b/src/allmydata/test/test_node.py
@@ -7,7 +7,7 @@ from twisted.python import log
 from foolscap.api import flushEventualQueue
 from twisted.application import service
 from allmydata.node import Node, formatTimeTahoeStyle
-from allmydata.util import fileutil
+from allmydata.util import fileutil, iputil
 import allmydata.test.common_util as testutil

 class LoggingMultiService(service.MultiService):
@@ -31,6 +31,36 @@ class TestCase(testutil.SignalMixin, unittest.TestCase):
         d.addCallback(flushEventualQueue)
         return d

+    def _mock_get_local_addresses_async(self):
+        self._get_local_addresses_async = iputil.get_local_addresses_async
+        iputil.get_local_addresses_async = lambda : ["1.2.3.4"]
+
+    def _unmock_get_local_addresses_async(self):
+        iputil.get_local_addresses_async = self._get_local_addresses_async
+
+    def test_anonymous_location(self):
+        self._mock_get_local_addresses_async()
+
+        basedir = "test_node/test_anonymous_location"
+        fileutil.make_dirs(basedir)
+        f = open(os.path.join(basedir, 'tahoe.cfg'), 'wt')
+        f.write("[node]\n")
+        f.write("tub.location = \n")
+        f.close()
+
+        n = TestNode(basedir)
+        n.setServiceParent(self.parent)
+        d = n.when_tub_ready()
+
+        def _check_addresses(ignored_result):
+            furl = n.tub.registerReference(n)
+            self.failIf("1.2.3.4" in furl, furl)
+            self.failUnless("127.0.0.1" in furl, furl)
+
+        d.addCallback(_check_addresses)
+        d.addCallback(lambda res: self._unmock_get_local_addresses_async())
+        return d
+
     def test_location(self):
         basedir = "test_node/test_location"
         fileutil.make_dirs(basedir)