diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index d0dcdba7ff..276c6ea644 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -31,7 +31,7 @@
     if (file_exists($vendor . "/autoload.php")) {
         require $vendor . "/autoload.php";
     } else {
-        throw new Exception("Unable to load dependencies");
+        throw new Exception("Unable to load dependency file '" . $vendor . "/autoload.php'. Did you use Composer to install PHPWord?");
     }
 }