diff --git a/Resources/bin/common.php b/Resources/bin/common.php
index cf47fa44..89d34591 100644
--- a/Resources/bin/common.php
+++ b/Resources/bin/common.php
@@ -9,6 +9,10 @@
  * file that was distributed with this source code.
  */
 
+if ('cli' !== \PHP_SAPI) {
+    throw new Exception('This script must be run from the command line.');
+}
+
 define('LINE_WIDTH', 75);
 
 define('LINE', str_repeat('-', LINE_WIDTH)."\n");
diff --git a/Resources/bin/update-data.php b/Resources/bin/update-data.php
index 2fffa4ec..2aeb141d 100644
--- a/Resources/bin/update-data.php
+++ b/Resources/bin/update-data.php
@@ -23,6 +23,10 @@
 use Symfony\Component\Intl\Locale;
 use Symfony\Component\Intl\Util\GitRepository;
 
+if ('cli' !== \PHP_SAPI) {
+    throw new Exception('This script must be run from the command line.');
+}
+
 require_once __DIR__.'/common.php';
 require_once __DIR__.'/autoload.php';