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-rw-r--r--activejob/lib/active_job/serializers/duration_serializer.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activejob/lib/active_job/serializers/duration_serializer.rb b/activejob/lib/active_job/serializers/duration_serializer.rb
index 94b0d0407a..a3c4c5d1c2 100644
--- a/activejob/lib/active_job/serializers/duration_serializer.rb
+++ b/activejob/lib/active_job/serializers/duration_serializer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module ActiveJob
module Serializers
class DurationSerializer < ObjectSerializer # :nodoc: