diff --git a/models/user.js b/models/user.js
index 8b18ee983..43bbde084 100644
--- a/models/user.js
+++ b/models/user.js
@@ -64,6 +64,7 @@ const UserSchema = new mongoose.Schema({
   displayName: {
     type: String,
     unique: true,
+    lowercase: true,
     required: true
   },