diff --git a/pupy/pupylib/PupyServer.py b/pupy/pupylib/PupyServer.py
index 1f1783a8..213d7d6b 100644
--- a/pupy/pupylib/PupyServer.py
+++ b/pupy/pupylib/PupyServer.py
@@ -66,6 +66,7 @@ class PupyServer(threading.Thread):
 
         if self.address:
             self.ipv6 = self.address.version == 6
+            self.address = str(self.address)
         else:
             self.ipv6 = self.config.getboolean('pupyd', 'ipv6')