diff --git a/phpstan.dist.neon b/phpstan.dist.neon
index 22710f59..3e2e4c01 100644
--- a/phpstan.dist.neon
+++ b/phpstan.dist.neon
@@ -1,5 +1,3 @@
-# Running PHPStan needs ext-relay.
-
 includes:
     - vendor/szepeviktor/phpstan-wordpress/extension.neon
 
diff --git a/tests/PHPStan/bootstrap.php b/tests/PHPStan/bootstrap.php
index f9b6307c..bc71349e 100644
--- a/tests/PHPStan/bootstrap.php
+++ b/tests/PHPStan/bootstrap.php
@@ -2,6 +2,11 @@
 
 declare(strict_types=1);
 
+if (!extension_loaded('relay')) {
+    error_log('Running PHPStan needs ext-relay.');
+    exit(2);
+}
+
 const HHVM_VERSION = '0.0.0';
 const WPINC = 'wp-includes';
 const WP_CONTENT_DIR = './';