diff --git a/luci-app-omr-bypass/root/etc/uci-defaults/41_omr-bypass b/luci-app-omr-bypass/root/etc/uci-defaults/41_omr-bypass
index dbb2be114..80fa1a362 100755
--- a/luci-app-omr-bypass/root/etc/uci-defaults/41_omr-bypass
+++ b/luci-app-omr-bypass/root/etc/uci-defaults/41_omr-bypass
@@ -82,6 +82,8 @@ if [ "$(uci -q get omr-bypass.lesnumeriques)" = "" ]; then
 		commit omr-bypass
 	EOF
 fi
-echo '0 2 * * * /etc/init.d/omr-bypass bypass_asn' > /etc/crontabs/bypass
+if [ ! -f /etc/crontabs/root ] || [ "$(cat /etc/crontabs/root | grep bypass)" = "" ]; then
+	echo "'0 2 * * * /etc/init.d/omr-bypass bypass_asn\n" > /etc/crontabs/root
+fi
 rm -f /tmp/luci-indexcache
 exit 0
diff --git a/openmptcprouter/files/etc/uci-defaults/1970-omr-vnstat b/openmptcprouter/files/etc/uci-defaults/1970-omr-vnstat
index d27027a96..86f74dae2 100755
--- a/openmptcprouter/files/etc/uci-defaults/1970-omr-vnstat
+++ b/openmptcprouter/files/etc/uci-defaults/1970-omr-vnstat
@@ -29,7 +29,8 @@ if [ "$(uci -q get openmptcprouter.latest_versions)" = "" ]; then
 	fi
 fi
 rm -f /tmp/luci-indexcache
-rm -f /etc/crontabs/vnstat
-echo '0 */2 * * * /etc/init.d/vnstat_backup backup' > /etc/crontabs/vnstat
+if [ ! -f /etc/crontabs/root ] || [ "$(cat /etc/crontabs/root | grep vnstat)" = "" ]; then
+	echo "0 */2 * * * /etc/init.d/vnstat_backup backup\n" >> /etc/crontabs/root
+fi
 
 exit 0