diff --git a/framework/core/src/Api/Schema/Relationship/ToMany.php b/framework/core/src/Api/Schema/Relationship/ToMany.php
index 418338e3b..b27470ebe 100644
--- a/framework/core/src/Api/Schema/Relationship/ToMany.php
+++ b/framework/core/src/Api/Schema/Relationship/ToMany.php
@@ -18,7 +18,7 @@ class ToMany extends BaseToMany
 {
     use FlarumRelationship;
 
-    public function serializeValue($value, Context $context): mixed
+    public function serializeValue(mixed $value, Context $context): mixed
     {
         if ($value && ! is_array($value) && method_exists($value, 'toArray')) {
             $value = $value->toArray();