diff --git a/test/rubygems/test_gem_commands_setup_command.rb b/test/rubygems/test_gem_commands_setup_command.rb
index b712c8a2a7f6..59ff45b61e53 100644
--- a/test/rubygems/test_gem_commands_setup_command.rb
+++ b/test/rubygems/test_gem_commands_setup_command.rb
@@ -245,9 +245,8 @@ def test_install_default_bundler_gem_with_force_flag
   def test_install_default_bundler_gem_with_destdir_flag
     @cmd.extend FileUtils
 
-    bin_dir = File.join(@gemhome, 'bin')
-
     destdir = File.join(@tempdir, 'foo')
+    bin_dir = File.join(destdir, 'bin')
 
     @cmd.options[:destdir] = destdir