diff --git a/db.py b/db.py
index 6f6176a..631b6b5 100644
--- a/db.py
+++ b/db.py
@@ -32,5 +32,5 @@ class DataBase():
         return (rv[0] if rv else None) if one else rv
 
     def insert_cadence(self, rpm, device_id):
-        self.execute('INSERT INTO cadence (rpm, device_id) VALUES (%s)',
+        self.execute('INSERT INTO cadence (rpm, device_id) VALUES (%s, %s)',
                      [rpm, device_id], commit=True, one=True)