diff --git a/lib/PoolCluster.js b/lib/PoolCluster.js
index 51158e793..1d8fdd609 100644
--- a/lib/PoolCluster.js
+++ b/lib/PoolCluster.js
@@ -182,7 +182,9 @@ PoolNamespace.prototype.getConnection = function(cb) {
   var namespace   = this;
 
   if (clusterNode === null) {
-    return cb(new Error('Pool does not exist.'));
+    var err = new Error('Pool does not exist.')
+    err.code = 'POOL_NONEXISTENT';
+    return cb(err);
   }
 
   cluster._getConnection(clusterNode, function(err, connection) {