diff --git a/app/controllers/repositories_controller.rb b/app/controllers/repositories_controller.rb
index 6195c640..4b0a8346 100644
--- a/app/controllers/repositories_controller.rb
+++ b/app/controllers/repositories_controller.rb
@@ -177,9 +177,10 @@ class RepositoriesController < ApplicationController
 
       @changeset = @repository.find_changeset_by_name(@rev)
       @changeset_to = @rev_to ? @repository.find_changeset_by_name(@rev_to) : nil
+      @diff_format_revisions = @repository.diff_format_revisions(@changeset, @changeset_to)
     end
   end
-  
+
   def stats  
   end
   
diff --git a/app/models/repository.rb b/app/models/repository.rb
index dee705c9..3a84a691 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -86,7 +86,14 @@ class Repository < ActiveRecord::Base
   def diff(path, rev, rev_to)
     scm.diff(path, rev, rev_to)
   end
-  
+
+  def diff_format_revisions(cs, cs_to, sep=':')
+    text = ""
+    text << cs_to.format_identifier + sep if cs_to
+    text << cs.format_identifier if cs
+    text
+  end
+
   # Returns a path relative to the url of the repository
   def relative_path(path)
     path
diff --git a/app/views/repositories/diff.rhtml b/app/views/repositories/diff.rhtml
index e2323549..efb84a44 100644
--- a/app/views/repositories/diff.rhtml
+++ b/app/views/repositories/diff.rhtml
@@ -1,4 +1,4 @@
-<h2><%= l(:label_revision) %> <%= format_revision(@changeset_to) + ':' if @changeset_to %><%= format_revision(@changeset) %> <%=h @path %></h2>
+<h2><%= l(:label_revision) %> <%= @diff_format_revisions %> <%=h @path %></h2>
 
 <!-- Choose view type -->
 <% form_tag({:path => to_path_param(@path)}, :method => 'get') do %>