diff --git a/sample/test.rb b/sample/test.rb
index 9cf62b8eb0..b16d7779c1 100644
--- a/sample/test.rb
+++ b/sample/test.rb
@@ -1280,7 +1280,7 @@ $y = Marshal.dump($x)
 test_ok($x == Marshal.load($y))
 
 StrClone=String.clone;
-test_ok(Marshal.load(Marshal.dump(StrClone.new("abc"))).type == StrClone)
+test_ok(Marshal.load(Marshal.dump(StrClone.new("abc"))).class == StrClone)
 
 test_check "pack"