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-rw-r--r--lib/rubygems/security.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rubygems/security.rb b/lib/rubygems/security.rb
index 606cd241f7..5832db7f8b 100644
--- a/lib/rubygems/security.rb
+++ b/lib/rubygems/security.rb
@@ -510,7 +510,7 @@ module Gem::Security
extensions = EXTENSIONS)
raise Gem::Security::Exception,
"incorrect signing key for re-signing " +
- "#{expired_certificate.subject}" unless
+ expired_certificate.subject.to_s unless
expired_certificate.check_private_key(private_key)
unless expired_certificate.subject.to_s ==