diff --git a/modules/rhizo_base/templates/osmo-nitb-bts.erb b/modules/rhizo_base/templates/osmo-nitb-bts.erb
index 69a771d..3ce3c25 100644
--- a/modules/rhizo_base/templates/osmo-nitb-bts.erb
+++ b/modules/rhizo_base/templates/osmo-nitb-bts.erb
@@ -56,7 +56,7 @@
   gprs ns timer tns-alive 3
   gprs ns timer tns-alive-retries 10
   gprs nsvc 0 nsvci 10<%= index+2 %>
-  gprs nsvc 0 local udp port 23<%= bts["lac"] %>
+  gprs nsvc 0 local udp port 23<%= index+Integer(bts["lac"]) %>
   gprs nsvc 0 remote udp port 23000
   gprs nsvc 0 remote ip <%= @sgsn_ip_address %>
   gprs nsvc 1 nsvci 0