diff --git a/tests/data/NetteObjectChild.php b/tests/data/NetteObjectChild.php
index 7a03c3c..6a7d622 100644
--- a/tests/data/NetteObjectChild.php
+++ b/tests/data/NetteObjectChild.php
@@ -25,7 +25,8 @@ protected function getProtectedProperty(): string
 		return 'protected';
 	}
 
-	public function methodAsClosureGetter() {
+	public function methodAsClosureGetter(): string
+	{
 		return 'methodAsClosureGetter';
 	}