diff --git a/ofagent/of_connection.py b/ofagent/of_connection.py
index a941111..8930472 100755
--- a/ofagent/of_connection.py
+++ b/ofagent/of_connection.py
@@ -98,7 +98,7 @@
         :return: None
         """
         assert self.connected
-
+        
         if msg.xid is None:
             msg.xid = self._gen_xid()
         buf = msg.pack()