diff --git a/lib/gollum/app.rb b/lib/gollum/app.rb
index 31219103..ba9bbcc2 100644
--- a/lib/gollum/app.rb
+++ b/lib/gollum/app.rb
@@ -125,7 +125,7 @@ module Precious
       end
 
       get '/assets/mathjax/*' do
-        env['PATH_INFO'].sub!("/gollum/assets/mathjax", '')
+        env['PATH_INFO'].sub!('/gollum/assets/mathjax', '')
         Rack::Static.new(not_found_proc, {:root => @mathjax_path, :urls => ['']}).call(env)
       end