diff --git a/addons/product/models/product.py b/addons/product/models/product.py
index 549aa9e4de3..9d7e268df66 100644
--- a/addons/product/models/product.py
+++ b/addons/product/models/product.py
@@ -32,10 +32,13 @@ class ProductCategory(models.Model):
         help="The number of products under this category (Does not consider the children categories)")
 
     def _compute_product_count(self):
-        read_group_res = self.env['product.template'].read_group([('categ_id', 'in', self.ids)], ['categ_id'], ['categ_id'])
+        read_group_res = self.env['product.template'].read_group([('categ_id', 'child_of', self.ids)], ['categ_id'], ['categ_id'])
         group_data = dict((data['categ_id'][0], data['categ_id_count']) for data in read_group_res)
         for categ in self:
-            categ.product_count = group_data.get(categ.id, 0)
+            product_count = 0
+            for sub_categ_id in categ.search([('id', 'child_of', categ.id)]).ids:
+                product_count += group_data.get(sub_categ_id, 0)
+            categ.product_count = product_count
 
     @api.constrains('parent_id')
     def _check_category_recursion(self):