diff --git a/test/reline/helper.rb b/test/reline/helper.rb
index 610fe3c08a..2d0c07192f 100644
--- a/test/reline/helper.rb
+++ b/test/reline/helper.rb
@@ -1,6 +1,6 @@
 $LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
 require 'reline'
-require 'test-unit'
+require 'test/unit'
 
 RELINE_TEST_ENCODING = Encoding.find(ENV['RELINE_TEST_ENCODING']) if ENV['RELINE_TEST_ENCODING']