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-rw-r--r--actionpack/lib/action_controller/mime_type.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/mime_type.rb b/actionpack/lib/action_controller/mime_type.rb
index a7215e6ea3..26edca3b69 100644
--- a/actionpack/lib/action_controller/mime_type.rb
+++ b/actionpack/lib/action_controller/mime_type.rb
@@ -1,3 +1,5 @@
+require 'set'
+
module Mime
SET = []
EXTENSION_LOOKUP = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }