diff --git a/lib/bundler/gem_helper.rb b/lib/bundler/gem_helper.rb
index e9ee03b8a2b..c4706a504d8 100644
--- a/lib/bundler/gem_helper.rb
+++ b/lib/bundler/gem_helper.rb
@@ -100,13 +100,25 @@ def install_gem(built_gem_path = nil, local = false)
   protected
 
     def rubygem_push(path)
-      gem_command = %W[gem push #{path}]
-      gem_command << "--key" << gem_key if gem_key
-      gem_command << "--host" << allowed_push_host if allowed_push_host
+      args = ["gem", "push", path]
+      args += ["--key", gem_key] if gem_key
+      args += ["--host", allowed_push_host] if allowed_push_host
+
       unless allowed_push_host || Bundler.user_home.join(".gem/credentials").file?
         raise "Your rubygems.org credentials aren't set. Run `gem push` to set them."
       end
-      sh(gem_command)
+
+      Bundler.ui.debug(args.join(" "))
+      SharedHelpers.chdir(base) do
+        IO.popen(args, :in => :in) do |io|
+          Thread.new { puts io.gets until io.eof? }.join
+          io.close
+        end
+      end
+
+      code = $?.exitstatus
+      exit code unless code.zero?
+
       Bundler.ui.confirm "Pushed #{name} #{version} to #{gem_push_host}"
     end