diff --git a/app/services/big_blue_button_api.rb b/app/services/big_blue_button_api.rb
index 76a2cbe967..70bb0f8675 100644
--- a/app/services/big_blue_button_api.rb
+++ b/app/services/big_blue_button_api.rb
@@ -52,7 +52,8 @@ def join_meeting(room:, role:, name: nil, avatar_url: nil)
       {
         role:,
         avatarURL: avatar_url,
-        createTime: room.last_session&.to_datetime&.strftime('%Q')
+        createTime: room.last_session&.to_datetime&.strftime('%Q'),
+        'userdata-bbb_override_default_locale'.to_sym => I18n.locale
       }.compact
     )
   end