diff --git a/metrology/collectd_exec_xmpp.sh b/metrology/collectd_exec_xmpp.sh
index 37c8153..2e6f549 100755
--- a/metrology/collectd_exec_xmpp.sh
+++ b/metrology/collectd_exec_xmpp.sh
@@ -32,7 +32,7 @@ ejabberdctl_stats() {
 
 http_upload_disk_usage() {
     subfolders_count=$(find ${HTTP_UPLOAD_DATADIR} -mindepth 1 -maxdepth 1 -type d | wc -l)
-    total_size=$(du -s ${HTTP_UPLOAD_DATADIR} | awk '{print $1}')
+    total_size=$(du --exclude=lost+found -s ${HTTP_UPLOAD_DATADIR} | awk '{print $1}')
     avg=$(( ${total_size} / ${subfolders_count} ))
     echo "PUTVAL \"${HOSTNAME}/xmpp_upload_data_total/count\" interval=$INTERVAL $(date +%s):${total_size}"
     echo "PUTVAL \"${HOSTNAME}/xmpp_upload_data_avg/count\" interval=$INTERVAL $(date +%s):${avg}"