diff --git a/lib/redmine_qbo/patches/issues_controller_patch.rb b/lib/redmine_qbo/patches/issues_controller_patch.rb
index 1a6496b..69a9358 100644
--- a/lib/redmine_qbo/patches/issues_controller_patch.rb
+++ b/lib/redmine_qbo/patches/issues_controller_patch.rb
@@ -15,8 +15,7 @@ module RedmineQbo
 
       module Helper
         def watcher_link(issue, user)
-          link = +''
-          link << link_to(I18n.t(:label_bill_time), bill_path( issue.id ), method: :get, class: 'icon icon-email-add') if user.admin?
+          link = link_to(I18n.t(:label_bill_time), bill_path( issue.id ), method: :get, class: 'icon icon-email-add') if user.admin?
           link << link_to(I18n.t(:label_share), share_path( issue.id ), method: :get, target: :_blank, class: 'icon icon-shared') if user.logged?
           link.html_safe + super
         end