diff --git a/purchase.py b/purchase.py
index f461d703c1..b42f052f5e 100644
--- a/purchase.py
+++ b/purchase.py
@@ -333,9 +333,7 @@ class Purchase(Workflow, ModelSQL, ModelView, TaxableMixin):
     @classmethod
     def default_warehouse(cls):
         Location = Pool().get('stock.location')
-        locations = Location.search(cls.warehouse.domain)
-        if len(locations) == 1:
-            return locations[0].id
+        return Location.get_default_warehouse()
 
     @staticmethod
     def default_company():