diff --git a/app/models/upload.rb b/app/models/upload.rb
index 83e5b046f..6d40295b1 100644
--- a/app/models/upload.rb
+++ b/app/models/upload.rb
@@ -226,7 +226,7 @@ class Upload < ActiveRecord::Base
       when "image/png"
         "png"
 
-      when "application/x-shockwave-flash"
+      when "application/x-shockwave-flash", "application/shockwave-flash"
         "swf"
 
       else