1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index 4c3deffe6e..a421c92441 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -83,7 +83,7 @@ module ActiveSupport
           data = signed_message.split("--".freeze)[0]
           @serializer.load(decode(data))
         rescue ArgumentError => argument_error
-          return if argument_error.message =~ %r{invalid base64}
+          return if argument_error.message.include?('invalid base64')
           raise
         end
       end