diff --git a/mqtt2log.py b/mqtt2log.py
index 3ced572..72f003a 100755
--- a/mqtt2log.py
+++ b/mqtt2log.py
@@ -13,7 +13,7 @@ MQTT_CLIENT_ID = 'MQTT_Logfile_Bridge'
 
 def on_connect(client, userdata, flags, reason_code, properties):
     """ The callback for when the client receives a CONNACK response from the server."""
-    print('Connected with result code ' + reason_code)
+    print(f"Connected with result code {reason_code}")
     client.subscribe(MQTT_TOPIC)
 
 def _parse_mqtt_message(topic, payload):