diff --git a/node-zookeeper-client/tsconfig.json b/node-zookeeper-client/tsconfig.json
index 1f5ffdedf8..7b493509d7 100644
--- a/node-zookeeper-client/tsconfig.json
+++ b/node-zookeeper-client/tsconfig.json
@@ -2,7 +2,7 @@
     "compilerOptions": {
         "module": "commonjs",
         "lib": [
-            "es5"
+            "es6"
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,