diff --git a/lib/PoolCluster.js b/lib/PoolCluster.js
index a69fd2eb6..43e0e08b2 100644
--- a/lib/PoolCluster.js
+++ b/lib/PoolCluster.js
@@ -101,7 +101,7 @@ PoolCluster.prototype._findNodeIds = function(pattern) {
 
   if (pattern === '*') { // all
     foundNodeIds = this._serviceableNodeIds;
-  } else  if (typeof this._serviceableNodeIds[pattern] !== 'undefined') { // one
+  } else  if (this._serviceableNodeIds.indexOf(pattern) != -1) { // one
     foundNodeIds = [pattern];
   } else { // wild matching
     var keyword = pattern.substring(pattern.length - 1, 0);