diff --git a/addons/account/models/account_analytic_line.py b/addons/account/models/account_analytic_line.py
index 68ac8cbff8a..0152730f22f 100644
--- a/addons/account/models/account_analytic_line.py
+++ b/addons/account/models/account_analytic_line.py
@@ -27,16 +27,16 @@ class AccountAnalyticLine(models.Model):
 
         result = 0.0
         prod_accounts = self.product_id.product_tmpl_id._get_product_accounts()
-        unit = self.product_uom_id.id
+        unit = self.product_uom_id
         account = prod_accounts['expense']
         if not unit or self.product_id.uom_po_id.category_id.id != unit.category_id.id:
-            unit = self.product_id.uom_po_id.id
+            unit = self.product_id.uom_po_id
 
         ctx = dict(self._context or {})
         if unit:
             # price_get() will respect a 'uom' in its context, in order
             # to return a default price for those units
-            ctx['uom'] = unit
+            ctx['uom'] = unit.id
 
         # Compute based on pricetype
         amount_unit = self.product_id.with_context(ctx).price_get('standard_price')[self.product_id.id]