diff --git a/lib/pool_cluster.js b/lib/pool_cluster.js
index 9edda501a2..eb2ab62d4a 100644
--- a/lib/pool_cluster.js
+++ b/lib/pool_cluster.js
@@ -362,4 +362,5 @@ class PoolCluster extends EventEmitter {
   }
 }
 
-module.exports = PoolCluster;
+exports.PoolNamespace = PoolNamespace;
+exports.PoolCluster = PoolCluster;