diff --git a/circle/vm/models/instance.py b/circle/vm/models/instance.py
index 0e90f92..e1b7ed5 100644
--- a/circle/vm/models/instance.py
+++ b/circle/vm/models/instance.py
@@ -61,6 +61,8 @@ def find_unused_vnc_port():
 
     if port is None:
         raise Exception("No unused port could be found for VNC.")
+    else:
+        return port
 
 
 class InstanceActiveManager(Manager):