diff --git a/ihatemoney/forms.py b/ihatemoney/forms.py
index e4a32d09..f6e89611 100644
--- a/ihatemoney/forms.py
+++ b/ihatemoney/forms.py
@@ -44,7 +44,7 @@ def get_billform_for(project, set_default=True, **kwargs):
 
     """
     form = BillForm(**kwargs)
-    if form.original_currency.data == "None":
+    if form.original_currency.data is None:
         form.original_currency.data = project.default_currency
 
     show_no_currency = form.original_currency.data == CurrencyConverter.no_currency