diff --git a/tests/phpstan/configs/gradual-level6.neon b/tests/phpstan/configs/gradual-level6.neon
index 6aa3e3e80..adf4eb0bf 100644
--- a/tests/phpstan/configs/gradual-level6.neon
+++ b/tests/phpstan/configs/gradual-level6.neon
@@ -1,5 +1,5 @@
 parameters:
-	#checkGenericClassInNonGenericObjectType: true
+	checkGenericClassInNonGenericObjectType: true
 	#checkMissingIterableValueType: true
 	checkMissingVarTagTypehint: true
 	checkMissingTypehints: true