diff --git a/lib/fileutils.rb b/lib/fileutils.rb
index 4c658ff62a..ff667fb1b0 100644
--- a/lib/fileutils.rb
+++ b/lib/fileutils.rb
@@ -6,7 +6,7 @@ rescue LoadError
   # for make mjit-headers
 end
 
-require "fileutils/version"
+require_relative "fileutils/version"
 
 #
 # = fileutils.rb