diff --git a/openbsc/doc/examples/osmo-nitb/hsl/openbsc.cfg b/openbsc/doc/examples/osmo-nitb/hsl/openbsc.cfg
index 3d95748..b0af855 100644
--- a/openbsc/doc/examples/osmo-nitb/hsl/openbsc.cfg
+++ b/openbsc/doc/examples/osmo-nitb/hsl/openbsc.cfg
@@ -31,7 +31,7 @@
  timer t3103 0
  timer t3105 0
  timer t3107 0
- timer t3109 0
+ timer t3109 4
  timer t3111 0
  timer t3113 60
  timer t3115 0