diff --git a/test/ripper/test_lexer.rb b/test/ripper/test_lexer.rb
index 30e5d78884..2efc3beea6 100644
--- a/test/ripper/test_lexer.rb
+++ b/test/ripper/test_lexer.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 begin
-  require_relative 'dummyparser'
+  require 'ripper'
   require 'test/unit'
   ripper_test = true
   module TestRipper; end