diff --git a/test/reline/config_test.rb b/test/reline/config_test.rb
index 053711f7cb..34ee407498 100644
--- a/test/reline/config_test.rb
+++ b/test/reline/config_test.rb
@@ -1,4 +1,4 @@
-require 'helper'
+require_relative 'helper'
 
 class Reline::Config::Test < Reline::TestCase
   def setup
diff --git a/test/reline/key_actor_emacs_test.rb b/test/reline/key_actor_emacs_test.rb
index e9ca433d8a..c387f1c4ee 100644
--- a/test/reline/key_actor_emacs_test.rb
+++ b/test/reline/key_actor_emacs_test.rb
@@ -1,4 +1,4 @@
-require 'helper'
+require_relative 'helper'
 require 'stringio'
 
 class Reline::KeyActor::Emacs::Test < Reline::TestCase
diff --git a/test/reline/key_actor_vi_test.rb b/test/reline/key_actor_vi_test.rb
index 763411199a..3f8d0fb462 100644
--- a/test/reline/key_actor_vi_test.rb
+++ b/test/reline/key_actor_vi_test.rb
@@ -1,4 +1,4 @@
-require 'helper'
+require_relative 'helper'
 
 class Reline::KeyActor::ViInsert::Test < Reline::TestCase
   def setup
diff --git a/test/reline/key_stroke_test.rb b/test/reline/key_stroke_test.rb
index 65d24cadb1..b6d5ce4150 100644
--- a/test/reline/key_stroke_test.rb
+++ b/test/reline/key_stroke_test.rb
@@ -1,4 +1,4 @@
-require 'helper'
+require_relative 'helper'
 
 class Reline::KeyStroke::Test < Reline::TestCase
   using Module.new {
diff --git a/test/reline/kill_ring_test.rb b/test/reline/kill_ring_test.rb
index fa871da4aa..8bebfe2177 100644
--- a/test/reline/kill_ring_test.rb
+++ b/test/reline/kill_ring_test.rb
@@ -1,4 +1,4 @@
-require 'helper'
+require_relative 'helper'
 
 class Reline::KillRing::Test < Reline::TestCase
   def setup