diff --git a/test/Util/Specification/Closure.php b/test/Util/Specification/Closure.php
index a804d1c..8127496 100644
--- a/test/Util/Specification/Closure.php
+++ b/test/Util/Specification/Closure.php
@@ -41,7 +41,7 @@ public function isSatisfiedBy($value): bool
         if (!\is_bool($isSatisfiedBy)) {
             throw new \RuntimeException(\sprintf(
                 'Closure should return bool, got "%s" instead.',
-                \is_object($value) ? \get_class($value) : \gettype($value),
+                \is_object($value) ? $value::class : \gettype($value),
             ));
         }