diff --git a/lib/dor/models/concerns/preservable.rb b/lib/dor/models/concerns/preservable.rb
index cb0a41a7..0bf6ec94 100644
--- a/lib/dor/models/concerns/preservable.rb
+++ b/lib/dor/models/concerns/preservable.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'tmpdir'
-
 module Dor
   module Preservable
     extend ActiveSupport::Concern