diff --git a/examples/controlnet.py b/examples/controlnet.py
index 50f989c..9633089 100755
--- a/examples/controlnet.py
+++ b/examples/controlnet.py
@@ -28,7 +28,7 @@ from mininet.log import setLogLevel, info
 class DataController( Controller ):
     """Data Network Controller.
        patched to avoid checkListening error and to delete intfs"""
-    
+
     def checkListening( self ):
         "Ignore spurious error"
         pass
@@ -36,7 +36,8 @@ class DataController( Controller ):
     def stop( self, *args, **kwargs ):
         "Make sure intfs are deleted"
         kwargs.update( deleteIntfs=True )
-        super( Controller, self ).stop( *args, **kwargs )
+        super( DataController, self ).stop( *args, **kwargs )
+
 
 class MininetFacade( object ):
     """Mininet object facade that allows a single CLI to