diff --git a/test/irb/test_completion.rb b/test/irb/test_completion.rb
index e2af6029bc..e9b422fe7a 100644
--- a/test/irb/test_completion.rb
+++ b/test/irb/test_completion.rb
@@ -3,6 +3,8 @@ require "test/unit"
 require "pathname"
 require "irb"
 
+require_relative "helper"
+
 module TestIRB
   class TestCompletion < Test::Unit::TestCase
     def setup