diff --git a/test/pathname/test_ractor.rb b/test/pathname/test_ractor.rb
index 3d7b63d..f1b618b 100644
--- a/test/pathname/test_ractor.rb
+++ b/test/pathname/test_ractor.rb
@@ -3,20 +3,14 @@
 require "pathname"
 
 class TestPathnameRactor < Test::Unit::TestCase
-  def setup
-    omit unless defined? Ractor
-  end
-
-  def test_ractor_shareable
-    assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
-    begin;
-      $VERBOSE = nil
-      require "pathname"
+  if respond_to?(:ractor)
+    ractor
+    def test_shareable
       r = Ractor.new Pathname("a") do |x|
         x.join(Pathname("b"), Pathname("c"))
       end
       assert_equal(Pathname("a/b/c"), r.take)
-    end;
+    end
   end
 end