diff --git a/src/Cart.php b/src/Cart.php
index a591bfa..1ad97f7 100644
--- a/src/Cart.php
+++ b/src/Cart.php
@@ -5,6 +5,7 @@ namespace Gloudemans\Shoppingcart;
 use Carbon\Carbon;
 use Money\Money;
 use Closure;
+use \InvalidArgumentException;
 use Gloudemans\Shoppingcart\Contracts\Buyable;
 use Gloudemans\Shoppingcart\Contracts\InstanceIdentifier;
 use Gloudemans\Shoppingcart\Exceptions\CartAlreadyStoredException;