diff --git a/plugins/provisioners/puppet/provisioner/puppet.rb b/plugins/provisioners/puppet/provisioner/puppet.rb
index cce0d4af8..28a3d8cf0 100644
--- a/plugins/provisioners/puppet/provisioner/puppet.rb
+++ b/plugins/provisioners/puppet/provisioner/puppet.rb
@@ -129,7 +129,7 @@ module VagrantPlugins
               @facter_config_path = "/ProgramData/PuppetLabs/facter/facts.d/vagrant_facts.yaml"
             end
             t = Tempfile.new("vagrant_facts.yaml")
-            t.write(config.facter)
+            t.write(config.facter.to_yaml)
             t.close()
             @machine.communicate.tap do |comm|
               comm.upload(t.path, File.join(@config.temp_dir, "vagrant_facts.yaml"))