diff --git a/mail.gemspec b/mail.gemspec
index faa5fed75..ae4b74eb5 100644
--- a/mail.gemspec
+++ b/mail.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |s|
   s.add_dependency('net-smtp')
   s.add_dependency('net-imap')
   s.add_dependency('net-pop')
+  s.add_dependency('net-http')
 
   s.add_development_dependency('bundler', '>= 1.0.3')
   s.add_development_dependency('rake', '> 0.8.7')