1 files changed, 1 insertions, 1 deletions
diff --git a/actionmailer/Rakefile b/actionmailer/Rakefile
index 457f3b7838..5d5539df1d 100644
--- a/actionmailer/Rakefile
+++ b/actionmailer/Rakefile
@@ -16,7 +16,7 @@ namespace :test do
   task :isolated do
     ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
     Dir.glob("test/**/*_test.rb").all? do |file|
-      sh(ruby, '-Ilib:test', file)
+      sh(ruby, '-w', '-Ilib:test', file)
     end or raise "Failures"
   end
 end