diff --git a/test/rubygems/test_gem_commands_which_command.rb b/test/rubygems/test_gem_commands_which_command.rb
index cbd5b5ef14ba..e114d6e689b2 100644
--- a/test/rubygems/test_gem_commands_which_command.rb
+++ b/test/rubygems/test_gem_commands_which_command.rb
@@ -38,8 +38,6 @@ def test_execute_directory
   end
 
   def test_execute_one_missing
-    # TODO: this test fails in isolation
-
     util_foo_bar
 
     @cmd.handle_options %w[foo_bar missinglib]