diff --git a/bin/gollum b/bin/gollum
index edf4215e..8b45d356 100755
--- a/bin/gollum
+++ b/bin/gollum
@@ -66,7 +66,7 @@ opts = OptionParser.new do |opts|
   end
 
   opts.on("--mathjax", "Enables mathjax.") do
-    options['mathjax'] = true
+    wiki_options[:mathjax] = true
   end
 end