diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 29e4ea5..88a99cb 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -58,7 +58,7 @@ class WikiPage < ActiveRecord::Base
   end
 
   def set_canonical_title
-    canonical_title = title.pretty_url
+    self.canonical_title = title.pretty_url
   end
 
   def set_position