diff --git a/lib/document_stores/postgres.js b/lib/document_stores/postgres.js
index 83e13f0..9aaa520 100644
--- a/lib/document_stores/postgres.js
+++ b/lib/document_stores/postgres.js
@@ -66,8 +66,8 @@ PostgresDocumentStore.prototype = {
 
   // A connection wrapper
   safeConnect: function (callback) {
-    this.pool.connect((err, client, done) => {
-      if (err) {
+    this.pool.connect((error, client, done) => {
+      if (error) {
         winston.error('error connecting to postgres', {error});
         callback(error);
       } else {