diff --git a/lib/db/mysql.js b/lib/db/mysql.js
index c1d4179165504bb49a84ae227901e08a7e52d4ec..0ecdc2738377d52928e1dbde9655cfc94dbc8672 100644
--- a/lib/db/mysql.js
+++ b/lib/db/mysql.js
@@ -454,7 +454,7 @@ exports.addTestUser = function(email, hash, cb) {
     });
 };
 
-exports.ping = function() {
+exports.ping = function(cb) {
   client.ping(function(err) {
     cb(err);
   });