diff --git a/src/ModelDescriber/JMSModelDescriber.php b/src/ModelDescriber/JMSModelDescriber.php
index 2c4360647..cc6abf2c3 100644
--- a/src/ModelDescriber/JMSModelDescriber.php
+++ b/src/ModelDescriber/JMSModelDescriber.php
@@ -361,7 +361,10 @@ public function describeItem(array $type, OA\Schema $property, Context $context,
             $modelRef = $this->modelRegistry->register($model);
 
             $customFields = (array) $property->jsonSerialize();
-            unset($customFields['property']);
+            unset(
+                $customFields['property'],
+                $customFields['nullable'],
+            );
             if ([] === $customFields) { // no custom fields
                 $property->ref = $modelRef;
             } else {
diff --git a/tests/Functional/Entity/JMSUser.php b/tests/Functional/Entity/JMSUser.php
index ba457d2de..0e3a9af43 100644
--- a/tests/Functional/Entity/JMSUser.php
+++ b/tests/Functional/Entity/JMSUser.php
@@ -13,6 +13,7 @@
 
 use JMS\Serializer\Annotation as Serializer;
 use OpenApi\Attributes as OA;
+use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * User.
@@ -95,6 +96,11 @@ class JMSUser
     #[Serializer\Expose]
     private $bestFriend;
 
+    #[Serializer\Type(User::class)]
+    #[Serializer\Expose]
+    #[Assert\NotNull]
+    private ?User $notNullFriend = null;
+
     /**
      * Whether this user is enabled or disabled.
      *
diff --git a/tests/Functional/Fixtures/JmsOptOutController.json b/tests/Functional/Fixtures/JmsOptOutController.json
index a0fe773ab..827284853 100644
--- a/tests/Functional/Fixtures/JmsOptOutController.json
+++ b/tests/Functional/Fixtures/JmsOptOutController.json
@@ -61,6 +61,9 @@
             "VirtualTypeClassDoesNotExistsHandlerDefined": {},
             "VirtualTypeClassDoesNotExistsHandlerNotDefined": {},
             "JMSUser": {
+                "required": [
+                    "not_null_friend"
+                ],
                 "properties": {
                     "id": {
                         "title": "userid",
@@ -130,6 +133,9 @@
                     "best_friend": {
                         "$ref": "#/components/schemas/User"
                     },
+                    "not_null_friend": {
+                        "$ref": "#/components/schemas/User"
+                    },
                     "status": {
                         "title": "Whether this user is enabled or disabled.",
                         "description": "Only enabled users may be used in actions.",
diff --git a/tests/Functional/JMSFunctionalTest.php b/tests/Functional/JMSFunctionalTest.php
index c3b577e52..963de9b0e 100644
--- a/tests/Functional/JMSFunctionalTest.php
+++ b/tests/Functional/JMSFunctionalTest.php
@@ -143,6 +143,9 @@ public function testModelDocumentation(): void
                 'best_friend' => [
                     '$ref' => '#/components/schemas/User',
                 ],
+                'not_null_friend' => [
+                    '$ref' => '#/components/schemas/User',
+                ],
                 'status' => [
                     'type' => 'string',
                     'title' => 'Whether this user is enabled or disabled.',
@@ -215,6 +218,7 @@ public function testModelDocumentation(): void
                     'type' => 'integer',
                 ],
             ],
+            'required' => ['not_null_friend'],
             'schema' => 'JMSUser',
         ], json_decode($this->getModel('JMSUser')->toJson(), true));