diff --git a/cron/parsegtfs.php b/cron/parsegtfs.php
index 6965136..06de52b 100644
--- a/cron/parsegtfs.php
+++ b/cron/parsegtfs.php
@@ -1,6 +1,11 @@
 <?php
 require_once(__DIR__."/../core.php");
 
+if (php_sapi_name() != "cli") {
+  security::notFound();
+  exit();
+}
+
 echo "[info] Getting gtfs.zip file...\n";
 $temp = tmpfile();
 tmbApi::request("static/datasets/gtfs.zip", $temp);