diff --git a/app/services/oauth/create_or_find_cas_user_service.rb b/app/services/oauth/create_or_find_cas_user_service.rb
index 0b6715471..761f9da58 100644
--- a/app/services/oauth/create_or_find_cas_user_service.rb
+++ b/app/services/oauth/create_or_find_cas_user_service.rb
@@ -14,7 +14,7 @@ class Oauth::CreateORFindCasUserService < ApplicationService
 
     return [open_user.user, false] if open_user.persisted?
 
-    @user = User.new(login: User.generate_login('C'), type: 'User', status: User::STATUS_ACTIVE, nickname: @params['comsys_name'], lastname: @params['comsys_name'])
+    @user = User.new(login: User.generate_login('C'), type: 'User', status: User::STATUS_ACTIVE, lastname: @params['comsys_name'])
 
     ActiveRecord::Base.transaction do
       @user.save!