diff --git a/app/helpers/issues_helper.rb b/app/helpers/issues_helper.rb
index a4213c6be..09d6ed5fa 100644
--- a/app/helpers/issues_helper.rb
+++ b/app/helpers/issues_helper.rb
@@ -94,6 +94,11 @@ module IssuesHelper
     s.html_safe
   end
 
+  # Returns a link for adding a new subtask to the given issue
+  def link_to_new_subtask(issue)
+    link_to(l(:button_add), {:controller => 'issues', :action => 'new', :project_id => issue.project, :issue => {:parent_issue_id => issue}})
+  end
+
   class IssueFieldsRows
     include ActionView::Helpers::TagHelper
 
diff --git a/app/views/issues/show.html.erb b/app/views/issues/show.html.erb
index 1313c833c..308f93b61 100644
--- a/app/views/issues/show.html.erb
+++ b/app/views/issues/show.html.erb
@@ -93,7 +93,7 @@ end %>
 <hr />
 <div id="issue_tree">
 <div class="contextual">
-  <%= link_to(l(:button_add), {:controller => 'issues', :action => 'new', :project_id => @project, :issue => {:parent_issue_id => @issue}}) if User.current.allowed_to?(:manage_subtasks, @project) %>
+  <%= link_to_new_subtask(@issue) if User.current.allowed_to?(:manage_subtasks, @project) %>
 </div>
 <p><strong><%=l(:label_subtask_plural)%></strong></p>
 <%= render_descendants_tree(@issue) unless @issue.leaf? %>