diff --git a/test/rubygems/test_gem_commands_help_command.rb b/test/rubygems/test_gem_commands_help_command.rb
index 8d20563a60..b85c6fb10f 100644
--- a/test/rubygems/test_gem_commands_help_command.rb
+++ b/test/rubygems/test_gem_commands_help_command.rb
@@ -48,7 +48,7 @@ class TestGemCommandsHelpCommand < Gem::TestCase
       if Gem::HAVE_OPENSSL
         assert_empty err
 
-        refute_match 'No command found for ', out
+        refute_match %r|No command found for |, out
       end
     end
   end
diff --git a/test/rubygems/test_gem_specification.rb b/test/rubygems/test_gem_specification.rb
index 0f895e3cf3..42988ad086 100644
--- a/test/rubygems/test_gem_specification.rb
+++ b/test/rubygems/test_gem_specification.rb
@@ -2619,7 +2619,7 @@ end
   def test_to_yaml
     yaml_str = @a1.to_yaml
 
-    refute_match '!!null', yaml_str
+    refute_match %r|!!null|, yaml_str
 
     same_spec = Gem::Specification.from_yaml(yaml_str)
 
diff --git a/test/rubygems/test_remote_fetch_error.rb b/test/rubygems/test_remote_fetch_error.rb
index 29aaaa8adb..6602f8205b 100644
--- a/test/rubygems/test_remote_fetch_error.rb
+++ b/test/rubygems/test_remote_fetch_error.rb
@@ -4,7 +4,7 @@ require 'rubygems/test_case'
 class TestRemoteFetchError < Gem::TestCase
   def test_password_redacted
     error = Gem::RemoteFetcher::FetchError.new('There was an error fetching', 'https://user:secret@gemsource.org')
-    refute_match 'secret', error.to_s
+    refute_match %r|secret|, error.to_s
   end
 
   def test_invalid_url