diff --git a/test/ruby/test_dir.rb b/test/ruby/test_dir.rb
index d8f6868aa6..b3630bf033 100644
--- a/test/ruby/test_dir.rb
+++ b/test/ruby/test_dir.rb
@@ -2,14 +2,13 @@ require 'test/unit'
 
 require 'tmpdir'
 require 'fileutils'
-require 'pathname'
 
 class TestDir < Test::Unit::TestCase
 
   def setup
     @verbose = $VERBOSE
     $VERBOSE = nil
-    @root = Pathname.new(Dir.mktmpdir('__test_dir__')).realpath.to_s
+    @root = File.realpath(Dir.mktmpdir('__test_dir__'))
     @nodir = File.join(@root, "dummy")
     for i in ?a..?z
       if i.ord % 2 == 0
diff --git a/test/ruby/test_rubyoptions.rb b/test/ruby/test_rubyoptions.rb
index c06d554cd9..486b68654d 100644
--- a/test/ruby/test_rubyoptions.rb
+++ b/test/ruby/test_rubyoptions.rb
@@ -3,7 +3,6 @@ require 'test/unit'
 
 require 'tmpdir'
 require 'tempfile'
-require 'pathname'
 
 require_relative 'envutil'
 
@@ -16,7 +15,7 @@ class TestRubyOptions < Test::Unit::TestCase
 
   def with_tmpchdir
     Dir.mktmpdir {|d|
-      d = Pathname.new(d).realpath.to_s
+      d = File.realpath(d)
       Dir.chdir(d) {
         yield d
       }