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-rw-r--r--activesupport/lib/active_support/core_ext/date/calculations.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/date/calculations.rb b/activesupport/lib/active_support/core_ext/date/calculations.rb
index 59efdbd1b6..04a32edefd 100644
--- a/activesupport/lib/active_support/core_ext/date/calculations.rb
+++ b/activesupport/lib/active_support/core_ext/date/calculations.rb
@@ -1,3 +1,5 @@
+require 'active_support/duration'
+
class Date
class << self
# Returns a new Date representing the date 1 day ago (i.e. yesterday's date).