diff --git a/config/default.rb b/config/default.rb
index 97f92fc53..099ff55ab 100644
--- a/config/default.rb
+++ b/config/default.rb
@@ -14,6 +14,7 @@ Vagrant.configure("2") do |config|
   config.vm.usable_port_range = (2200..2250)
   config.vm.box_url = nil
   config.vm.base_mac = nil
+  config.vm.client_cert = nil
   config.vm.graceful_halt_retry_count = 60
   config.vm.graceful_halt_retry_interval = 1
   config.vm.guest = :linux