diff --git a/lib/vagrant/bundler.rb b/lib/vagrant/bundler.rb
index 7ba48435f..62ac456f1 100644
--- a/lib/vagrant/bundler.rb
+++ b/lib/vagrant/bundler.rb
@@ -425,7 +425,7 @@ module Vagrant
         runtime_dependencies.each { |d| gem d.name, *d.requirement.as_list }
       # discover all the gems we have available
       list = {}
-      directories = [Gem::Specification.default_specifications_dir]
+      directories = [Gem.default_specifications_dir]
       Gem::Specification.find_all{true}.each do |spec|
         list[spec.full_name] = spec
       end