diff --git a/test/t/class.rb b/test/t/class.rb
index 6a0a3225c..290ecf74a 100644
--- a/test/t/class.rb
+++ b/test/t/class.rb
@@ -365,7 +365,7 @@ assert('clone Class') do
     end
   end
 
-  Foo.clone.new.func
+  assert_true(Foo.clone.new.func)
 end
 
 assert('class variable and class << self style class method') do