diff --git a/lib/models/revision.js b/lib/models/revision.js
index 6f3a746..225a95d 100644
--- a/lib/models/revision.js
+++ b/lib/models/revision.js
@@ -110,7 +110,7 @@ module.exports = function (sequelize, DataTypes) {
           where: {
             noteId: note.id
           },
-          order: '"createdAt" DESC'
+          order: [['createdAt', 'DESC']]
         }).then(function (revisions) {
           var data = []
           for (var i = 0, l = revisions.length; i < l; i++) {
@@ -131,7 +131,7 @@ module.exports = function (sequelize, DataTypes) {
           where: {
             noteId: note.id
           },
-          order: '"createdAt" DESC'
+          order: [['createdAt', 'DESC']]
         }).then(function (revisions) {
           if (revisions.length <= 0) return callback(null, null)
           // measure target revision position
@@ -142,7 +142,7 @@ module.exports = function (sequelize, DataTypes) {
                 $gte: time
               }
             },
-            order: '"createdAt" DESC'
+            order: [['createdAt', 'DESC']]
           }).then(function (count) {
             if (count <= 0) return callback(null, null)
             sendDmpWorker({
@@ -231,7 +231,7 @@ module.exports = function (sequelize, DataTypes) {
           where: {
             noteId: note.id
           },
-          order: '"createdAt" DESC'
+          order: [['createdAt', 'DESC']]
         }).then(function (revisions) {
           if (revisions.length <= 0) {
             // if no revision available