diff --git a/einstein/server.py b/einstein/server.py
index a6a1653..f142499 100644
--- a/einstein/server.py
+++ b/einstein/server.py
@@ -50,6 +50,7 @@ def __init__(self, monitors=None, subscriptions=None, dumpfilename=None):
     def datagramReceived(self, data, addr):
         log.debug("Datagram received!", addr=addr)
 
+        _, port = addr
         if port == packets.PORT_CONNECTION_INDICATION:
             self.handleConnectionIndication(data, addr)
         else: