diff --git a/util/postinstall.sh.in b/util/postinstall.sh.in
index 67796442..93cfdec9 100755
--- a/util/postinstall.sh.in
+++ b/util/postinstall.sh.in
@@ -417,7 +417,6 @@ webui_install() {
 
    chmod 770 $DOCROOT/tmp $DOCROOT/images
    chgrp $WWWGROUP $DOCROOT/tmp
-   chgrp $WWWGROUP $DOCROOT/system/helper/phpqrcode/cache
 
    echo "<?php" > $DOCROOT/config-site.php
    echo >> $DOCROOT/config-site.php