diff --git a/lib/index.js b/lib/index.js
index 5f1cea07..423c3ed3 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -22,6 +22,7 @@ PG.prototype.end = function() {
   var self = this;
   Object.keys(self.pools.all).forEach(function(key) {
     var pool = self.pools.all[key];
+    delete self.pools.all[key];
     pool.drain(function() {
       pool.destroyAllNow();
     });