diff --git a/ihatemoney/currency_convertor.py b/ihatemoney/currency_convertor.py
index 8d42de36..32fe8709 100644
--- a/ihatemoney/currency_convertor.py
+++ b/ihatemoney/currency_convertor.py
@@ -13,7 +13,7 @@ class Singleton(type):
 
 class CurrencyConverter(object, metaclass=Singleton):
     # Get exchange rates
-    default = "XXX"
+    no_currency = "XXX"
     api_url = "https://api.exchangeratesapi.io/latest?base=USD"
 
     def __init__(self):
@@ -22,19 +22,19 @@ class CurrencyConverter(object, metaclass=Singleton):
     @cached(cache=TTLCache(maxsize=1, ttl=86400))
     def get_rates(self):
         rates = requests.get(self.api_url).json()["rates"]
-        rates[self.default] = 1.0
+        rates[self.no_currency] = 1.0
         return rates
 
     def get_currencies(self):
         rates = [rate for rate in self.get_rates()]
-        rates.sort(key=lambda rate: "" if rate == self.default else rate)
+        rates.sort(key=lambda rate: "" if rate == self.no_currency else rate)
         return rates
 
     def exchange_currency(self, amount, source_currency, dest_currency):
         if (
             source_currency == dest_currency
-            or source_currency == self.default
-            or dest_currency == self.default
+            or source_currency == self.no_currency
+            or dest_currency == self.no_currency
         ):
             return amount
 
diff --git a/ihatemoney/forms.py b/ihatemoney/forms.py
index c4c198a9..1bdc17d5 100644
--- a/ihatemoney/forms.py
+++ b/ihatemoney/forms.py
@@ -47,11 +47,11 @@ def get_billform_for(project, set_default=True, **kwargs):
     if form.original_currency.data == "None":
         form.original_currency.data = project.default_currency
 
-    if form.original_currency.data != CurrencyConverter.default:
+    if form.original_currency.data != CurrencyConverter.no_currency:
         form.original_currency.choices.remove(
             (
-                CurrencyConverter.default,
-                render_localized_currency(CurrencyConverter.default, detailed=False),
+                CurrencyConverter.no_currency,
+                render_localized_currency(CurrencyConverter.no_currency, detailed=False),
             )
         )
 
@@ -266,7 +266,7 @@ class BillForm(FlaskForm):
         bill.external_link = ""
         bill.date = self.date
         bill.owers = [Person.query.get(ower, project) for ower in self.payed_for]
-        bill.original_currency = CurrencyConverter.default
+        bill.original_currency = CurrencyConverter.no_currency
         bill.converted_amount = self.currency_helper.exchange_currency(
             bill.amount, bill.original_currency, project.default_currency
         )
diff --git a/ihatemoney/migrations/versions/927ed575acbd_add_currencies.py b/ihatemoney/migrations/versions/927ed575acbd_add_currencies.py
index b70d9025..88b8a5b0 100644
--- a/ihatemoney/migrations/versions/927ed575acbd_add_currencies.py
+++ b/ihatemoney/migrations/versions/927ed575acbd_add_currencies.py
@@ -23,7 +23,7 @@ def upgrade():
         sa.Column(
             "original_currency",
             sa.String(length=3),
-            server_default=CurrencyConverter.default,
+            server_default=CurrencyConverter.no_currency,
             nullable=True,
         ),
     )
@@ -42,7 +42,7 @@ def upgrade():
         sa.Column(
             "default_currency",
             sa.String(length=3),
-            server_default=CurrencyConverter.default,
+            server_default=CurrencyConverter.no_currency,
             nullable=True,
         ),
     )
diff --git a/ihatemoney/web.py b/ihatemoney/web.py
index a2cd6b77..ae124ac5 100644
--- a/ihatemoney/web.py
+++ b/ihatemoney/web.py
@@ -393,10 +393,10 @@ def edit_project():
     if edit_form.validate_on_submit():
         project = edit_form.update(g.project)
         # Update converted currency
-        if project.default_currency != CurrencyConverter.default:
+        if project.default_currency != CurrencyConverter.no_currency:
             for bill in project.get_bills():
 
-                if bill.original_currency == CurrencyConverter.default:
+                if bill.original_currency == CurrencyConverter.no_currency:
                     bill.original_currency = project.default_currency
 
                 bill.converted_amount = CurrencyConverter().exchange_currency(