diff --git a/install_roundcube.sh b/install_roundcube.sh
index cecaea4..692db41 100755
--- a/install_roundcube.sh
+++ b/install_roundcube.sh
@@ -759,7 +759,7 @@ if ! grep -q -E "${WEBSITE_BASEDIR}/htdocs/bin/cleandb.sh" /tmp/tmp_crontab 2> /
 	echo "" >> /tmp/tmp_crontab
 	echo "# - Keep roundcube database slick and clean" >> /tmp/tmp_crontab
 	echo "# -" >> /tmp/tmp_crontab
-	echo "37 3 * * * ${WEBSITE_BASEDIR}/htdocs/bin/cleandb.sh" >> /tmp/tmp_crontab
+	echo "37 3 * * * su - www-data -c \"${WEBSITE_BASEDIR}/htdocs/bin/cleandb.sh > /dev/null\" -s /bin/bash" >> /tmp/tmp_crontab
 	crontab /tmp/tmp_crontab > $log_file 2>&1
 	if [[ $? -eq 0 ]]; then
 		echo_ok