diff --git a/plugins/kernel_v2/config/vm.rb b/plugins/kernel_v2/config/vm.rb
index 89f70b5c5..474f1005e 100644
--- a/plugins/kernel_v2/config/vm.rb
+++ b/plugins/kernel_v2/config/vm.rb
@@ -15,6 +15,7 @@ module VagrantPlugins
 
       attr_accessor :base_mac
       attr_accessor :box
+      attr_accessor :client_cert
       attr_accessor :box_url
       attr_accessor :graceful_halt_retry_count
       attr_accessor :graceful_halt_retry_interval