diff --git a/test/ruby/test_econv.rb b/test/ruby/test_econv.rb
index f667d733a0..7899f1fa6c 100644
--- a/test/ruby/test_econv.rb
+++ b/test/ruby/test_econv.rb
@@ -1,5 +1,5 @@
 require 'test/unit'
-require 'envutil'
+require_relative 'envutil'
 
 class TestEncodingConverter < Test::Unit::TestCase
   def check_ec(edst, esrc, eres, dst, src, ec, off, len, opts=nil)