diff --git a/product_category_tax/product.py b/product_category_tax/product.py
index 64bb198..a82154b 100644
--- a/product_category_tax/product.py
+++ b/product_category_tax/product.py
@@ -50,7 +50,7 @@ class ProductTemplate(models.Model):
     _name = 'product.template'
 
     @api.one
-    @api.constrains('taxes_id', 'supplier_taxes_id')
+    @api.constrains('taxes_id', 'supplier_taxes_id', 'categ_id')
     def _check_tax_categ(self):
         # self.name != 'Pay Debt' is a stupid hack to avoid blocking the
         # installation of the module 'pos_debt_notebook'