diff --git a/tools/test/topos/optical2.py b/tools/test/topos/optical2.py
index 36cdbad..b778592 100644
--- a/tools/test/topos/optical2.py
+++ b/tools/test/topos/optical2.py
@@ -69,7 +69,7 @@
 
 
 def run():
-    c = RemoteController('c','127.0.0.1',6633)
+    c = RemoteController('c','127.0.0.1',6653)
     net = Mininet( topo=OpticalTopo(),controller=None,autoSetMacs=True)
     net.addController(c)
     net.start()