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-rw-r--r--activesupport/test/core_ext/duration_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index be33324f25..c5022cf5b1 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -5,6 +5,7 @@ require "active_support/inflector"
require "active_support/time"
require "active_support/json"
require "time_zone_test_helpers"
+require "yaml"
class DurationTest < ActiveSupport::TestCase
include TimeZoneTestHelpers