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