diff --git a/stoptime.rb b/stoptime.rb
index f0da048..a462ba1 100644
--- a/stoptime.rb
+++ b/stoptime.rb
@@ -53,6 +53,7 @@ module StopTime
   # for all controllers and views.
   def service(*a)
     @config = StopTime::Models::Config.instance
+    @format = @request.path_info[/.([^.]+)/, 1];
     super(*a)
   end