diff --git a/src/freedombone-utils-dns b/src/freedombone-utils-dns
index b1f436f8..e8f62f18 100755
--- a/src/freedombone-utils-dns
+++ b/src/freedombone-utils-dns
@@ -112,6 +112,9 @@ function create_freedns_updater {
     if [ -f /usr/bin/dynamicdns ]; then
         rm /usr/bin/dynamicdns
     fi
+    if grep -q "dynamicdns" /etc/crontab; then
+        sed -i '/dynamicdns/d' /etc/crontab
+    fi
 
     # add the update command to cron
     if ! grep -q "/usr/local/bin/freedombone-freedns" /etc/crontab; then