diff --git a/plugins/commands/serve/mappers/synced_folder.rb b/plugins/commands/serve/mappers/synced_folder.rb
index 8b42dd325..7aba82f09 100644
--- a/plugins/commands/serve/mappers/synced_folder.rb
+++ b/plugins/commands/serve/mappers/synced_folder.rb
@@ -60,7 +60,7 @@ module VagrantPlugins
         end
 
         def converter(client)
-          Vagrant::Plugin::V2::SyncedFolder.new(client)
+          Vagrant::Plugin::V2::SyncedFolder.new(client: client)
         end
       end
     end