diff --git a/install.sh b/install.sh
index 50a1ca0..24ffba3 100755
--- a/install.sh
+++ b/install.sh
@@ -203,9 +203,10 @@ install_crontab()
     if [[ -x $(command -v crontab) ]]; then
         fmt_note "installing \"$CRON_JOB\" to crontab ..."
         if ! crontab -l 1>/dev/null 2>&1; then
-            echo -n | crontab -
+            echo "$CRON_JOB" | crontab -
+        else
+            ( crontab -l | grep -vxF "${CRON_JOB}" | grep -v "no crontab for"; echo "$CRON_JOB" ) | crontab -
         fi
-        ( crontab -l | grep -vxF "${CRON_JOB}" | grep -v "no crontab for"; echo "$CRON_JOB" ) | crontab -
     else
         fmt_warning "crontab does not exist. skipping ..."
     fi