diff --git a/addons/account_analytic_default/account_analytic_default.py b/addons/account_analytic_default/account_analytic_default.py
index d6b94b446ed..8a1f09d2f37 100644
--- a/addons/account_analytic_default/account_analytic_default.py
+++ b/addons/account_analytic_default/account_analytic_default.py
@@ -71,12 +71,11 @@ class account_invoice_line(osv.osv):
         return res
 
     def _set_additional_fields(self, invoice):
-        rec = self.env['account.analytic.default'].account_get(self.product_id.id, self.invoice_id.partner_id.id, self._uid,
+        if not self.account_analytic_id:
+            rec = self.env['account.analytic.default'].account_get(self.product_id.id, self.invoice_id.partner_id.id, self._uid,
                                                                time.strftime('%Y-%m-%d'), company_id=self.company_id.id, context=self._context)
-        if rec:
-            self.account_analytic_id = rec.analytic_id.id
-        else:
-            self.account_analytic_id = False
+            if rec:
+                self.account_analytic_id = rec.analytic_id.id
         super(account_invoice_line, self)._set_additional_fields(invoice)
 
 class stock_picking(osv.osv):