diff --git a/mininet/node.py b/mininet/node.py
index 005eb7829c727f921d0dd686ad52b04f2d9307f8..c6a887970a66e0627e95eaf82ec6cee35836494c 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -283,7 +283,7 @@ def MAC( self ):
             return macs[ 0 ]
         else:
             return None
-        
+
     def intfIsUp( self, port ):
         """Check if interface for a given port number is up.
            port: port number"""