diff --git a/install_dehydrated.sh b/install_dehydrated.sh
index 5cd76fb..f0b826c 100755
--- a/install_dehydrated.sh
+++ b/install_dehydrated.sh
@@ -2884,8 +2884,8 @@ EOF
 elif [[ "$DH_CRON_TYPE" = "system" ]]; then
 
    echononl "   Activate dehydrated cronjob in /etc/cron.d/"
-   if grep $(basename "${DH_CRON_SCRIPT}") /etc/cron.d/* > /dev/null 2>&1 \
-      && grep $(basename "${DH_UPDATE_SSL_DIRECTIVES_SCRIPT}") /etc/cron.d/* > /dev/null 2>&1 ; then
+   if grep -q $(basename "${DH_CRON_SCRIPT}") /etc/cron.d/* 2> /dev/null \
+      && grep -q $(basename "${DH_UPDATE_SSL_DIRECTIVES_SCRIPT}") /etc/cron.d/* 2> /dev/null ; then
       echo_skipped
       info "Cronjobs already activated."
    else