diff --git a/test/test_configdsl.rb b/test/test_configdsl.rb
index 0fe5e3d670..1c3cf650b9 100644
--- a/test/test_configdsl.rb
+++ b/test/test_configdsl.rb
@@ -1,6 +1,7 @@
 require_relative 'helper'
 require 'fluent/config/dsl'
 require 'fluent/test'
+require 'tempfile'
 
 class ConfigDSLTest < Test::Unit::TestCase
   # TEST_CONFIG1 = %[
@@ -107,8 +108,12 @@ def test_config_error
 
   def test_with_ruby_keyword
     uname_string = `uname -a`
+    tmpfile = Tempfile.create('fluentd-test')
+    tmpfile.write(uname_string)
+    tmpfile.close
+
     root1 = Fluent::Config::DSL::Parser.parse(<<DSL)
-uname_str = ruby.open('|uname -a'){|out| out.read}
+uname_str = ruby.open("#{tmpfile.path}"){|out| out.read}
 source {
   uname uname_str
 }
@@ -144,5 +149,7 @@ def test_with_ruby_keyword
 }
 DSL
     assert_raise (NoMethodError) { Fluent::Config::DSL::Parser.parse(conf3) }
+  ensure
+    File.delete(tmpfile.path)
   end
 end