diff --git a/src/Models/Product.php b/src/Models/Product.php
index 72905aa2..18e052e8 100644
--- a/src/Models/Product.php
+++ b/src/Models/Product.php
@@ -148,9 +148,10 @@ public function toItem(Itemable $itemable, array $attributes = []): Item
             return $variant->toItem($itemable, $attributes);
         }
 
-        return $this->items()->make(array_merge($attributes, [
+        return $this->items()->make(array_merge([
             'name' => $this->name,
             'price' => $this->getPrice($itemable->getCurrency()),
-        ]))->setRelation('buyable', $this);
+            'quantity' => 1,
+        ], $attributes))->setRelation('buyable', $this);
     }
 }
diff --git a/src/Models/Variant.php b/src/Models/Variant.php
index e17eb04f..4717d867 100644
--- a/src/Models/Variant.php
+++ b/src/Models/Variant.php
@@ -110,9 +110,10 @@ public function getPrice(?string $currency = null): ?float
      */
     public function toItem(Itemable $itemable, array $attributes = []): Item
     {
-        return $this->items()->make(array_merge($attributes, [
+        return $this->items()->make(array_merge([
             'name' => sprintf('%s - %s', $this->product->name, $this->alias),
             'price' => $this->getPrice($itemable->getCurrency()),
-        ]))->setRelation('buyable', $this);
+            'quantity' => 1,
+        ], $attributes))->setRelation('buyable', $this);
     }
 }