diff --git a/railties/Rakefile b/railties/Rakefile
index be9a77d4e45..aa1dfa5dabe 100755
--- a/railties/Rakefile
+++ b/railties/Rakefile
@@ -17,8 +17,7 @@ namespace :test do
     dir = ENV["TEST_DIR"] || "**"
     Dir["test/#{dir}/*_test.rb"].each do |file|
       next true if file.include?("fixtures")
-      ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
-      sh(ruby, '-Itest', "-I#{File.dirname(__FILE__)}/../activesupport/lib", file)
+      ruby '-Itest', "-I#{File.dirname(__FILE__)}/../activesupport/lib", file
     end
   end
 end