diff --git a/esp32/host/upload-via-mqtt.sh b/esp32/host/upload-via-mqtt.sh
index 500ce40..6a4bf44 100755
--- a/esp32/host/upload-via-mqtt.sh
+++ b/esp32/host/upload-via-mqtt.sh
@@ -21,6 +21,7 @@ fi
 mosquitto_pub -h $mqttHost -t "${mqttPrefix}${homieId}/stay/alive/set" -m "1" -r
 echo "Waiting ..."
 mosquitto_sub -h $mqttHost -t "${mqttPrefix}${homieId}/#" -R -C 1
+set -e
 python ota_updater.py -l $mqttHost -t "$mqttPrefix" -i "$homieId" $firmwareFile
 
 mosquitto_pub -h $mqttHost -t "${mqttPrefix}${homieId}/stay/alive/set" -m "0" -r