diff --git a/addons/purchase/models/purchase.py b/addons/purchase/models/purchase.py
index de25d8b29fc..e44f177afad 100644
--- a/addons/purchase/models/purchase.py
+++ b/addons/purchase/models/purchase.py
@@ -192,7 +192,7 @@ class PurchaseOrder(models.Model):
         if not self.partner_id:
             self.fiscal_position_id = False
             self.payment_term_id = False
-            self.currency_id = False
+            self.currency_id = self.env.user.company_id.currency_id.id
         else:
             self.fiscal_position_id = self.env['account.fiscal.position'].with_context(company_id=self.company_id.id).get_fiscal_position(self.partner_id.id)
             self.payment_term_id = self.partner_id.property_supplier_payment_term_id.id