diff --git a/tool/test-bundled-gems.rb b/tool/test-bundled-gems.rb
index f5e3685235..a71d7dce7e 100644
--- a/tool/test-bundled-gems.rb
+++ b/tool/test-bundled-gems.rb
@@ -60,7 +60,7 @@ File.foreach("#{gem_dir}/bundled_gems") do |line|
     load_path = true
 
   when "test-unit"
-    test_command = "#{ruby} -C #{gem_dir}/src/#{gem} test/run-test.rb"
+    test_command = "#{ruby} -C #{gem_dir}/src/#{gem} test/run.rb"
 
   when "win32ole"
     next unless /mswin|mingw/ =~ RUBY_PLATFORM