diff --git a/source/app/models/version.rb b/source/app/models/version.rb
index 2a336d6..806db21 100644
--- a/source/app/models/version.rb
+++ b/source/app/models/version.rb
@@ -141,7 +141,7 @@
   
   # Relative path to the diff file
   def relpath_to_diff(from_version)
-    return '/' + self.wiki.rel_path + '/' + self.page.rel_path + "_EPFWIKI_DIFF_V#{from_version.version}_V#{self.version}.html"  
+    return ENV['EPFWIKI_BASE_URL'] + self.wiki.rel_path + '/' + self.page.rel_path + "_EPFWIKI_DIFF_V#{from_version.version}_V#{self.version}.html"  
   end
   
   # Path intermediate (tidied, cleaned) HTML files, prepared for XHTMLDiff