diff --git a/ihatemoney/forms.py b/ihatemoney/forms.py
index ee8be07b..88afd296 100644
--- a/ihatemoney/forms.py
+++ b/ihatemoney/forms.py
@@ -195,7 +195,7 @@ class BillForm(FlaskForm):
         bill.payer_id = self.payer
         bill.amount = self.amount
         bill.what = self.what
-        bill.external_link = u""
+        bill.external_link = ""
         bill.date = self.date
         bill.owers = [Person.query.get(ower, project) for ower in self.payed_for]