diff --git a/lib/jekyll/post.rb b/lib/jekyll/post.rb
index d028a290..91eacc6d 100644
--- a/lib/jekyll/post.rb
+++ b/lib/jekyll/post.rb
@@ -163,7 +163,7 @@ module Jekyll
       if self.site.lsi
         self.class.lsi ||= begin
           puts "Starting the classifier..."
-          lsi = Classifier::LSI.new :auto_rebuild => false
+          lsi = Classifier::LSI.new(:auto_rebuild => false)
           $stdout.print("  Populating LSI... ");$stdout.flush
           posts.each { |x| $stdout.print(".");$stdout.flush;lsi.add_item(x) }
           $stdout.print("\n  Rebuilding LSI index... ")