diff --git a/app/logical/media_file/flash.rb b/app/logical/media_file/flash.rb
index f7e4c8c5c..c734936f3 100644
--- a/app/logical/media_file/flash.rb
+++ b/app/logical/media_file/flash.rb
@@ -54,4 +54,5 @@ class MediaFile::Flash < MediaFile
 
     [width, height]
   end
+  memoize :dimensions
 end