diff --git a/bin/grav b/bin/grav
index 79015cea1..998b90afc 100755
--- a/bin/grav
+++ b/bin/grav
@@ -5,6 +5,13 @@ if (version_compare($ver = PHP_VERSION, $req = '5.4.0', '<')) {
     exit(sprintf("You are running PHP %s, but Grav needs at least PHP %s to run.\n", $ver, $req));
 }
 
+if (!file_exists(__DIR__ . '/../vendor')){
+    // Before we can even start, we need to run composer first
+    echo "Preparing to install vendor dependencies...\n\n";
+    echo system('php bin/composer.phar --working-dir="'.__DIR__.'/../" --no-interaction install -o');
+    echo "\n\n";
+}
+
 use Symfony\Component\Console\Application;
 
 require_once(__DIR__ . '/../vendor/autoload.php');