1 files changed, 2 insertions, 1 deletions

diff --git a/server/models/user.js b/server/models/user.js
index 36ed723cc..6cb9eec3f 100644
--- a/server/models/user.js
+++ b/server/models/user.js
@@ -40,7 +40,8 @@ module.exports = function (sequelize, DataTypes) {
     {
       indexes: [
         {
-          fields: [ 'username' ]
+          fields: [ 'username' ],
+          unique: true
         }
       ],
       classMethods: {