diff --git a/src/data/runtime/RuntimeDataDescriber.php b/src/data/runtime/RuntimeDataDescriber.php
index 7866dabdc..6eb552a7b 100644
--- a/src/data/runtime/RuntimeDataDescriber.php
+++ b/src/data/runtime/RuntimeDataDescriber.php
@@ -92,7 +92,7 @@ interface RuntimeDataDescriber extends RuntimeEnumDescriber{
 	/**
 	 * @phpstan-template T of \UnitEnum
 	 * @phpstan-param T &$case
-	 * @phpstan-param-out T &$case
+	 * @phpstan-param-out T $case
 	 */
 	public function enum(\UnitEnum &$case) : void;