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-rw-r--r--actionmailer/lib/action_mailer/inline_preview_interceptor.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/inline_preview_interceptor.rb b/actionmailer/lib/action_mailer/inline_preview_interceptor.rb
index 980415afe0..4bef4a58d3 100644
--- a/actionmailer/lib/action_mailer/inline_preview_interceptor.rb
+++ b/actionmailer/lib/action_mailer/inline_preview_interceptor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "base64"
module ActionMailer