diff --git a/examples/tree1024.py b/examples/tree1024.py
index 3c96770..e7abd7e 100755
--- a/examples/tree1024.py
+++ b/examples/tree1024.py
@@ -7,7 +7,7 @@ to adjust them, e.g. by adding entries to /etc/sysctl.conf
 and running sysctl -p.
 """
    
-from mininet import init, TreeNet
+from mininet import init, TreeNet, Cli
 
 if __name__ == '__main__':
    init()