diff --git a/openvidu-server/docker/openvidu-server-pro/entrypoint.sh b/openvidu-server/docker/openvidu-server-pro/entrypoint.sh
index fbd9f538..3cc14047 100755
--- a/openvidu-server/docker/openvidu-server-pro/entrypoint.sh
+++ b/openvidu-server/docker/openvidu-server-pro/entrypoint.sh
@@ -35,7 +35,7 @@ if [ "${OPENVIDU_PRO_ELASTICSEARCH}" == "false" ]; then
 fi
 
 # Wait for Kibana service
-if [ -n "${WAIT_KIBANA_URL}" ]; then
+if [ -n "${WAIT_KIBANA_URL:-}" ]; then
     printf "\n"
     printf "\n  ======================================="
     printf "\n      Waiting for Kibana service."