diff --git a/TheengsGateway/ble_gateway.py b/TheengsGateway/ble_gateway.py
index cbd23ec..2433a57 100644
--- a/TheengsGateway/ble_gateway.py
+++ b/TheengsGateway/ble_gateway.py
@@ -153,7 +153,7 @@ def on_connect(
                 self.subscribe(self.configuration["subscribe_topic"])
             else:
                 logger.error(
-                    "Failed to connect to MQTT broker %s:%d reason code: %d",
+                    "Failed to connect to MQTT broker %s:%d reason code: %s",
                     self.configuration["host"],
                     self.configuration["port"],
                     reason_code,
@@ -174,7 +174,7 @@ def on_disconnect(
                 logger.info("Disconnected from MQTT broker")
             else:
                 logger.error(
-                    "Disconnected from MQTT broker with reason code = %d", reason_code
+                    "Disconnected from MQTT broker with reason code = %s", reason_code
                 )
 
         if self.configuration["enable_websocket"]: