diff --git a/test/readline/helper.rb b/test/readline/helper.rb
index 8e1a06cb3e..6afbaf7ed9 100644
--- a/test/readline/helper.rb
+++ b/test/readline/helper.rb
@@ -23,6 +23,6 @@ else
   end
 
   def finish_using_lib_reline
-    Reline.test_reset
+    Reline.instance_variable_set(:@core, nil)
   end
 end