diff --git a/app/views/attachments/file.html.erb b/app/views/attachments/file.html.erb
index 37db6f2bc..186b85c69 100644
--- a/app/views/attachments/file.html.erb
+++ b/app/views/attachments/file.html.erb
@@ -6,7 +6,7 @@
 <p><%= link_to_attachment @attachment, :text => l(:button_download), :download => true -%>
    <span class="size">(<%= number_to_human_size @attachment.filesize %>)</span>&nbsp&nbsp&nbsp
    <span class="size">
-     <% if @attachment!=nil&&@attachment.container_type == 'Document' %>
+     <% if @attachment!=nil&&@attachment.container_type == 'Document'&&User.current.allowed_to?({:controller => 'code_review', :action => 'update_diff_view'}, @attachment.project) %>
           <%=    link = link_to(l(:button_add), {:controller => 'code_review',
                                           :action => 'assign', :action_type => 'attachment',
                                           :id=>@attachment.project,