diff --git a/account.py b/account.py
index 3553891c64..f4316494d2 100644
--- a/account.py
+++ b/account.py
@@ -67,4 +67,4 @@ class InvoiceLine:
 
     @fields.depends('origin')
     def on_change_account(self):
-        return super(InvoiceLine, self).on_change_account()
+        super(InvoiceLine, self).on_change_account()