diff --git a/plugins/kernel_v2/config/vm_provider.rb b/plugins/kernel_v2/config/vm_provider.rb
index 24735b3ce..7d9672e09 100644
--- a/plugins/kernel_v2/config/vm_provider.rb
+++ b/plugins/kernel_v2/config/vm_provider.rb
@@ -30,6 +30,7 @@ module VagrantPlugins
         @logger.info("Configuring provider #{@name} with #{config_class}")
         @config = config_class.new
         block.call(@config) if block
+        @config.finalize!
       end
     end
   end