diff --git a/test/rubygems/test_gem_package.rb b/test/rubygems/test_gem_package.rb
index 29e2ce86b1..54ba245b32 100644
--- a/test/rubygems/test_gem_package.rb
+++ b/test/rubygems/test_gem_package.rb
@@ -608,7 +608,7 @@ class TestGemPackage < Gem::Package::TarTestCase
         bogus_data = Gem.gzip 'hello'
         fake_signer = Class.new do
           def digest_name; 'SHA512'; end
-          def digest_algorithm; Digest(:SHA512); end
+          def digest_algorithm; OpenSSL::Digest::SHA512; end
           def key; 'key'; end
           def sign(*); 'fake_sig'; end
         end
-- 
2.17.1