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-rw-r--r--activesupport/lib/active_support/cache/memory_store.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/cache/memory_store.rb b/activesupport/lib/active_support/cache/memory_store.rb
index 66ce1bc93a..e6085d97ec 100644
--- a/activesupport/lib/active_support/cache/memory_store.rb
+++ b/activesupport/lib/active_support/cache/memory_store.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/object/duplicable'
+
module ActiveSupport
module Cache
# A cache store implementation which stores everything into memory in the