diff --git a/systemvm/patches/debian/config/opt/cloud/bin/configure.py b/systemvm/patches/debian/config/opt/cloud/bin/configure.py
index 6f3c755d46b..93be03ac95a 100755
--- a/systemvm/patches/debian/config/opt/cloud/bin/configure.py
+++ b/systemvm/patches/debian/config/opt/cloud/bin/configure.py
@@ -423,7 +423,7 @@ class CsForwardingRules(CsDataBag):
         if ports_parts[0] == ports_parts[1]:
             return str(ports_parts[0])
         else:
-            return "%s%s%s" % (port_parts, delimiter, port_parts[1])
+            return "%s%s%s" % (ports_parts[0], delimiter, ports_parts[1])
 
     def processForwardRule(self, rule):
         # FIXME this seems to be different for regular VRs?