diff --git a/src/sharding/ShardClientUtil.js b/src/sharding/ShardClientUtil.js
index 1c47f0296..8b8262150 100644
--- a/src/sharding/ShardClientUtil.js
+++ b/src/sharding/ShardClientUtil.js
@@ -86,7 +86,7 @@ class ShardClientUtil {
    */
   broadcastEval(script) {
     return new Promise((resolve, reject) => {
-      script = typeof script !== 'function' ? `(${script})(this)` : script;
+      script = typeof script === 'function' ? `(${script})(this)` : script;
       const listener = message => {
         if (!message || message._sEval !== script) return;
         process.removeListener('message', listener);