diff --git a/test/fiber/test_scheduler.rb b/test/fiber/test_scheduler.rb
index f8993bb18f..34effad816 100644
--- a/test/fiber/test_scheduler.rb
+++ b/test/fiber/test_scheduler.rb
@@ -118,7 +118,7 @@ class TestFiberScheduler < Test::Unit::TestCase
   end
 
   def test_autoload
-    100.times do
+    10.times do
       Object.autoload(:TestFiberSchedulerAutoload, File.expand_path("autoload.rb", __dir__))
 
       thread = Thread.new do