diff --git a/scenarios/invite_peerout_failover/sipp_scenario_responder00.xml b/scenarios/invite_peerout_failover/sipp_scenario_responder00.xml
index 25bf1211..7d0e5ed9 100644
--- a/scenarios/invite_peerout_failover/sipp_scenario_responder00.xml
+++ b/scenarios/invite_peerout_failover/sipp_scenario_responder00.xml
@@ -22,5 +22,8 @@
     ]]>
   </send>
 
+  <recv request="ACK">
+  </recv>
+
 </scenario>