diff --git a/app/views/repositories/diff.html.erb b/app/views/repositories/diff.html.erb
index 738b481..4dcaefb 100644
--- a/app/views/repositories/diff.html.erb
+++ b/app/views/repositories/diff.html.erb
@@ -1,8 +1,9 @@
 <h2><%= l(:label_revision) %> <%= @diff_format_revisions %> <%=h @path %></h2>
 
 <!-- Choose view type -->
-<% form_tag({:path => to_path_param(@path)}, :method => 'get') do %>
-  <%= hidden_field_tag('rev', params[:rev]) if params[:rev] %>
+<% form_tag({:action => 'diff', :id => @project,
+             :repository_id => @repository.identifier_param,
+             :path => to_path_param(@path), :rev => @rev}, :method => 'get') do %>
   <%= hidden_field_tag('rev_to', params[:rev_to]) if params[:rev_to] %>
   <p>
     <label><%= l(:label_view_diff) %></label>