diff --git a/lib/jasmine/headless/jst_template.rb b/lib/jasmine/headless/jst_template.rb
index b6d8f1c..b5f68e1 100644
--- a/lib/jasmine/headless/jst_template.rb
+++ b/lib/jasmine/headless/jst_template.rb
@@ -3,6 +3,9 @@ require 'sprockets/jst_processor'
 module Jasmine::Headless
   class JSTTemplate < Sprockets::JstProcessor
     include Jasmine::Headless::FileChecker
+
+    self.default_mime_type = 'application/javascript'
+
     def evaluate(*args)
       if bad_format?(file)
         alert_bad_format(file)