diff --git a/jvb/rootfs/defaults/sip-communicator.properties b/jvb/rootfs/defaults/sip-communicator.properties
index da5c7e9..65eab3c 100644
--- a/jvb/rootfs/defaults/sip-communicator.properties
+++ b/jvb/rootfs/defaults/sip-communicator.properties
@@ -2,7 +2,9 @@ org.jitsi.videobridge.AUTHORIZED_SOURCE_REGEXP={{ .Env.JICOFO_AUTH_USER }}@{{ .E
 org.jitsi.videobridge.SINGLE_PORT_HARVESTER_PORT={{ .Env.JVB_PORT }}
 org.jitsi.videobridge.DISABLE_TCP_HARVESTER={{ .Env.JVB_TCP_HARVESTER_DISABLED }}
 org.jitsi.videobridge.TCP_HARVESTER_PORT={{ .Env.JVB_TCP_PORT }}
+{{ if .Env.JVB_STUN_SERVERS }}
 org.ice4j.ice.harvest.STUN_MAPPING_HARVESTER_ADDRESSES={{ .Env.JVB_STUN_SERVERS }}
+{{ end }}
 
 org.jitsi.videobridge.xmpp.user.shard.HOSTNAME={{ .Env.XMPP_SERVER }}
 org.jitsi.videobridge.xmpp.user.shard.DOMAIN={{ .Env.XMPP_AUTH_DOMAIN }}