diff --git a/util/postinstall.sh.in b/util/postinstall.sh.in
index 4b787ce..b91f3b7 100755
--- a/util/postinstall.sh.in
+++ b/util/postinstall.sh.in
@@ -414,6 +414,7 @@
 webui_install() {
 
    chmod 770 $DOCROOT/tmp $DOCROOT/images
+   chown $PILERUSER $DOCROOT/tmp
    chgrp $WWWGROUP $DOCROOT/tmp
 
    echo "<?php" > $DOCROOT/config-site.php