diff --git a/plugins/commands/serve/client/box.rb b/plugins/commands/serve/client/box.rb
index 33eb92a85..534e6dc57 100644
--- a/plugins/commands/serve/client/box.rb
+++ b/plugins/commands/serve/client/box.rb
@@ -33,7 +33,7 @@ module VagrantPlugins
 
         # @param [String] path
         def repackage(path)
-          client.repackage(SDK::Args::Path.new(path: path))
+          client.repackage(SDK::Args::Path.new(path: path.to_s))
         end
 
         # @return [String] path