diff --git a/sambanas/rootfs/etc/s6-overlay/s6-rc.d/mqtt-handler/run b/sambanas/rootfs/etc/s6-overlay/s6-rc.d/mqtt-handler/run
index 1b3bf639..548ad79c 100755
--- a/sambanas/rootfs/etc/s6-overlay/s6-rc.d/mqtt-handler/run
+++ b/sambanas/rootfs/etc/s6-overlay/s6-rc.d/mqtt-handler/run
@@ -28,7 +28,7 @@ if [ -f /root/.config/mosquitto_pub ]; then
 
         log_level=$(bashio::string.lower "$(bashio::config log_level info)")
 
-        exec /usr/bin/python /usr/local/bin/mqtt_daemon.py -b $host -p $port -u $username -P $password -t $topic -v $(bashio::addon.version) -L $log_level
+        exec /usr/bin/python /usr/local/bin/mqtt_daemon.py -b $host -p $port -u $username -P $password -t $topic -v $(bashio::addon.version) -L ${log_level^^}
     else
         bashio::log.info "MQTT integration"