diff --git a/app.py b/app.py
index 8c3fff8..e9ee6b2 100644
--- a/app.py
+++ b/app.py
@@ -20,7 +20,7 @@ error_messages = {
 GROCY_URL = os.getenv('GROCY_URL')
 GROCY_API_KEY = os.getenv('GROCY_API_KEY')
 GROCY_PORT = os.getenv('GROCY_PORT')
-CASHBOX_USERID = os.getenv('CASHBOX_USER_ID')
+CASHBOX_USERID = int(os.getenv('CASHBOX_USER_ID'))
 
 
 g = Grocy(GROCY_URL, GROCY_API_KEY, port=GROCY_PORT)