diff --git a/server/util-server.js b/server/util-server.js
index 2862c17a9..b6b5c731a 100644
--- a/server/util-server.js
+++ b/server/util-server.js
@@ -1203,7 +1203,7 @@ exports.zookeeperConnect = function (zookeeperHost, timeoutMs = 5000) {
 
         socket.on("connect", function () {
             log.debug("zookeeper", `connected to zookeeper: ${host}:${port}`);
-            socket.write(`ruok\n`, (err) => {
+            socket.write("ruok\n", (err) => {
                 if (err) {
                     log.debug("zookeeper", `error while writing to host [${err.message}]`);
                     reject(err);