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-rw-r--r--activesupport/lib/active_support/message_verifier.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index 0474b476df..2b8817f05c 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/string/bytesize'
+
module ActiveSupport
# MessageVerifier makes it easy to generate and verify messages which are signed
# to prevent tampering.