diff --git a/get_data.py b/get_data.py
index 4917584..3cae87c 100644
--- a/get_data.py
+++ b/get_data.py
@@ -54,7 +54,7 @@ def send_to_mqtt(data: MQTTdata) -> None:
             "payload": data["battery"],
         },
         {
-            "topic": "sensors/home/{data['mac']}/tele/SENSOR",
+            "topic": f"sensors/home/{data['mac']}/tele/SENSOR",
             "payload": json.dumps(data),
         },
     ]