diff --git a/mininet/nodelib.py b/mininet/nodelib.py
index 2c445a3..682b608 100644
--- a/mininet/nodelib.py
+++ b/mininet/nodelib.py
@@ -94,7 +94,6 @@ class NAT( Node ):
 
         if self.flush:
             self.cmd( 'sysctl net.ipv4.ip_forward=0' )
-            
             self.cmd( 'iptables -F' )
             self.cmd( 'iptables -t nat -F' )
             # Create default entries for unmatched traffic