diff --git a/lib/rubygems/mock_gem_ui.rb b/lib/rubygems/mock_gem_ui.rb
index d5a0fa2be6..fab292d42a 100644
--- a/lib/rubygems/mock_gem_ui.rb
+++ b/lib/rubygems/mock_gem_ui.rb
@@ -29,7 +29,7 @@ class Gem::MockGemUi < Gem::StreamUI
   module TTY
     attr_accessor :tty
 
-    def tty?()
+    def tty?
       @tty = true unless defined?(@tty)
       @tty
     end
diff --git a/test/rubygems/test_gem_package.rb b/test/rubygems/test_gem_package.rb
index aa80550b41..de12360e6e 100644
--- a/test/rubygems/test_gem_package.rb
+++ b/test/rubygems/test_gem_package.rb
@@ -811,7 +811,7 @@ class TestGemPackage < Gem::Package::TarTestCase
 
   def test_load_spec
     entry = StringIO.new Gem::Util.gzip @spec.to_yaml
-    def entry.full_name()
+    def entry.full_name
       "metadata.gz"
     end
 
@@ -1111,7 +1111,7 @@ class TestGemPackage < Gem::Package::TarTestCase
 
   def test_verify_entry
     entry = Object.new
-    def entry.full_name()
+    def entry.full_name
       raise ArgumentError, "whatever"
     end
 
@@ -1140,7 +1140,7 @@ class TestGemPackage < Gem::Package::TarTestCase
       $good_name = vm
 
       entry = Object.new
-      def entry.full_name()
+      def entry.full_name
         $good_name
       end
 
@@ -1161,7 +1161,7 @@ class TestGemPackage < Gem::Package::TarTestCase
       $bad_name = vm
 
       entry = Object.new
-      def entry.full_name()
+      def entry.full_name
         $bad_name
       end
 
diff --git a/test/rubygems/test_gem_remote_fetcher.rb b/test/rubygems/test_gem_remote_fetcher.rb
index 22d64923d6..e2c912cdcf 100644
--- a/test/rubygems/test_gem_remote_fetcher.rb
+++ b/test/rubygems/test_gem_remote_fetcher.rb
@@ -656,7 +656,7 @@ PeIQQkFng2VVot/WAQbv3ePqWq07g1BBcwIBAg==
         res
       else
         res = Net::HTTPOK.new nil, 200, nil
-        def res.body()
+        def res.body
           "real_path"
         end
         res
@@ -721,7 +721,7 @@ PeIQQkFng2VVot/WAQbv3ePqWq07g1BBcwIBAg==
     def fetcher.request(uri, request_class, last_modified = nil)
       $fetched_uri = uri
       res = Net::HTTPOK.new nil, 200, nil
-      def res.body()
+      def res.body
         "success"
       end
       res
diff --git a/test/rubygems/test_gem_security_policy.rb b/test/rubygems/test_gem_security_policy.rb
index 82eb317499..f272e554e5 100644
--- a/test/rubygems/test_gem_security_policy.rb
+++ b/test/rubygems/test_gem_security_policy.rb
@@ -452,7 +452,7 @@ class TestGemSecurityPolicy < Gem::TestCase
     package.checksums[Gem::Security::DIGEST_NAME] = {}
 
     s = StringIO.new metadata_gz
-    def s.full_name()
+    def s.full_name
       "metadata.gz"
     end
 
@@ -477,7 +477,7 @@ class TestGemSecurityPolicy < Gem::TestCase
     package.checksums[Gem::Security::DIGEST_NAME] = {}
 
     s = StringIO.new metadata_gz
-    def s.full_name()
+    def s.full_name
       "metadata.gz"
     end
 
@@ -508,7 +508,7 @@ class TestGemSecurityPolicy < Gem::TestCase
     package.checksums[Gem::Security::DIGEST_NAME] = {}
 
     s = StringIO.new metadata_gz
-    def s.full_name()
+    def s.full_name
       "metadata.gz"
     end