diff --git a/core/apps/wherehouse/serializers/invalid_product.py b/core/apps/wherehouse/serializers/invalid_product.py
index e7e0ff7..cd7773c 100644
--- a/core/apps/wherehouse/serializers/invalid_product.py
+++ b/core/apps/wherehouse/serializers/invalid_product.py
@@ -52,6 +52,7 @@ class InvalidProductCreateSerializer(serializers.Serializer):
             )
             invalid_product.witnesses.set(witnesses_ids)
             invalid_product.inventory.is_invalid = True
+            invalid_product.inventory.quantity -= validated_data.get('amount')
             invalid_product.inventory.save()
             invalid_product.save()
             return invalid_product