diff --git a/lib/vagrant/bundler.rb b/lib/vagrant/bundler.rb
index ff60b327b..f6414eacd 100644
--- a/lib/vagrant/bundler.rb
+++ b/lib/vagrant/bundler.rb
@@ -265,7 +265,7 @@ module Vagrant
 
       # Reset the all specs override that Bundler does
       old_all = Gem::Specification._all
-      Gem::Specification.all = nil
+      Gem::Specification.reset
 
       # /etc/gemrc and so on.
       old_config = nil