diff --git a/brmbar3/brmbar/Currency.py b/brmbar3/brmbar/Currency.py
index 3033287..61d6a75 100644
--- a/brmbar3/brmbar/Currency.py
+++ b/brmbar3/brmbar/Currency.py
@@ -130,5 +130,5 @@ class Currency:
     def update_buy_rate(self, source, rate):
         self.db.execute(
             "SELECT public.update_currency_buy_rate(%s, %s, %s)",
-            [source.id, self.id, rate],
+            [self.id, source.id, rate],
         )