diff --git a/stoptime.rb b/stoptime.rb
index d4aa24d..4a93522 100644
--- a/stoptime.rb
+++ b/stoptime.rb
@@ -61,6 +61,7 @@ module StopTime
   def service(*a)
     @config = StopTime::Models::Config.instance
     @format = @request.path_info[/.([^.]+)/, 1];
+    @headers["Content-Type"] = "text/html; charset=utf-8"
     super(*a)
   end