diff --git a/lib/rubygems/test_case.rb b/lib/rubygems/test_case.rb
index c847023e18..b5c377f43a 100644
--- a/lib/rubygems/test_case.rb
+++ b/lib/rubygems/test_case.rb
@@ -98,7 +98,7 @@ end
 # and uninstall gems, fetch remote gems through a stub fetcher and be assured
 # your normal set of gems is not affected.
 
-class Gem::TestCase < (defined?(Minitest::Test) ? Minitest::Test : MiniTest::Unit::TestCase)
+class Gem::TestCase < Minitest::Test
 
   extend Gem::Deprecate
 
diff --git a/test/rubygems/test_bundled_ca.rb b/test/rubygems/test_bundled_ca.rb
index ad66f3e616..e6761dd197 100644
--- a/test/rubygems/test_bundled_ca.rb
+++ b/test/rubygems/test_bundled_ca.rb
@@ -27,11 +27,7 @@ if ENV["CI"] || ENV["TEST_SSL"]
     end
 
     def assert_https(host)
-      if self.respond_to? :_assertions # minitest <= 4
-        self._assertions += 1
-      else # minitest >= 5
-        self.assertions += 1
-      end
+      self.assertions += 1
       http = Net::HTTP.new(host, 443)
       http.use_ssl = true
       http.verify_mode = OpenSSL::SSL::VERIFY_PEER