diff --git a/lib/generators/devise_token_auth/templates/devise_token_auth_create_users.rb.erb b/lib/generators/devise_token_auth/templates/devise_token_auth_create_users.rb.erb
index c773a2ce7..b1aec3236 100644
--- a/lib/generators/devise_token_auth/templates/devise_token_auth_create_users.rb.erb
+++ b/lib/generators/devise_token_auth/templates/devise_token_auth_create_users.rb.erb
@@ -48,7 +48,7 @@ class DeviseTokenAuthCreate<%= user_class.pluralize %> < ActiveRecord::Migration
     add_index :<%= user_class.pluralize.underscore %>, :email,                unique: true
     add_index :<%= user_class.pluralize.underscore %>, [:uid, :provider],     unique: true
     add_index :<%= user_class.pluralize.underscore %>, :reset_password_token, unique: true
-    # add_index :<%= user_class.pluralize.underscore %>, :confirmation_token, unique: true
+    add_index :<%= user_class.pluralize.underscore %>, :confirmation_token,   unique: true
     # add_index :<%= user_class.pluralize.underscore %>, :unlock_token,       unique: true
   end
 end