diff --git a/lib/vagrant/action/builtin/cloud_init_setup.rb b/lib/vagrant/action/builtin/cloud_init_setup.rb
index 6674eb05d..9a30d1488 100644
--- a/lib/vagrant/action/builtin/cloud_init_setup.rb
+++ b/lib/vagrant/action/builtin/cloud_init_setup.rb
@@ -98,10 +98,9 @@ module Vagrant
 
               File.open("#{source_dir}/meta-data", 'w') { |file| file.write(meta_data.to_s) }
 
-              iso_path = env[:env].host.capability(:create_iso, env[:env],
+              iso_path = env[:env].host.capability(:create_iso,
                                                    source_dir, volume_id: "cidata")
-
-              attach_disk_config(machine, env, iso_path)
+              attach_disk_config(machine, env, iso_path.to_path)
             ensure
               FileUtils.remove_entry(source_dir)
             end
diff --git a/test/unit/vagrant/action/builtin/cloud_init_setup_test.rb b/test/unit/vagrant/action/builtin/cloud_init_setup_test.rb
index f5fb89f48..8607e5dee 100644
--- a/test/unit/vagrant/action/builtin/cloud_init_setup_test.rb
+++ b/test/unit/vagrant/action/builtin/cloud_init_setup_test.rb
@@ -106,7 +106,7 @@ describe Vagrant::Action::Builtin::CloudInitSetup do
       expect(File).to receive(:open).with("#{source_dir}/user-data", 'w').and_return(true)
       expect(File).to receive(:open).with("#{source_dir}/meta-data", 'w').and_return(true)
       expect(FileUtils).to receive(:remove_entry).with(source_dir).and_return(true)
-      allow(host).to receive(:capability).with(:create_iso, machine_env, source_dir, volume_id: "cidata").and_return(iso_path)
+      allow(host).to receive(:capability).with(:create_iso, source_dir, volume_id: "cidata").and_return(iso_path)
       expect(vm.disks).to receive(:each)
 
       subject.write_cfg_iso(machine, env, message, {})