diff --git a/src/Hydra/JsonSchema/SchemaFactory.php b/src/Hydra/JsonSchema/SchemaFactory.php
index 4a6f1aae794..476667c5812 100644
--- a/src/Hydra/JsonSchema/SchemaFactory.php
+++ b/src/Hydra/JsonSchema/SchemaFactory.php
@@ -190,6 +190,7 @@ public function buildSchema(string $className, string $format = 'jsonld', string
                 'type' => 'object',
                 'required' => [
                     $hydraPrefix.'member',
+                    'items' => ['type' => 'object'],
                 ],
                 'properties' => [
                     $hydraPrefix.'member' => [