diff --git a/packages/core/src/Actions/Carts/AssociateUser.php b/packages/core/src/Actions/Carts/AssociateUser.php
index 213ef62ad9..b8917546d4 100644
--- a/packages/core/src/Actions/Carts/AssociateUser.php
+++ b/packages/core/src/Actions/Carts/AssociateUser.php
@@ -18,7 +18,7 @@ public function execute(Cart $cart, LunarUser $user, $policy = 'merge'): self
         if ($policy == 'merge') {
             $userCart = Cart::whereUserId($user->getKey())->active()->unMerged()->latest()->first();
             if ($userCart) {
-                app(MergeCart::class)->execute($userCart, $cart);
+                app(MergeCart::class)->execute($cart, $userCart);
             }
         }