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-rw-r--r--activesupport/lib/active_support/core_ext/hash/diff.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/diff.rb b/activesupport/lib/active_support/core_ext/hash/diff.rb
index 5f3868b5b0..4359213380 100644
--- a/activesupport/lib/active_support/core_ext/hash/diff.rb
+++ b/activesupport/lib/active_support/core_ext/hash/diff.rb
@@ -1,3 +1,5 @@
+require 'active_support/deprecation'
+
class Hash
# Returns a hash that represents the difference between two hashes.
#