1 files changed, 4 insertions, 3 deletions
diff --git a/matrix-specification/Responses/ClientSyncGetResponse.php b/matrix-specification/Responses/ClientSyncGetResponse.php
index ccdc5e6..dbe2a29 100644
--- a/matrix-specification/Responses/ClientSyncGetResponse.php
+++ b/matrix-specification/Responses/ClientSyncGetResponse.php
@@ -7,8 +7,9 @@ use Matrix\Data\DeviceLists;
 use Matrix\Data\Presence;
 use Matrix\Data\Room\Rooms;
 use Matrix\Data\ToDevice;
+use Matrix\Response;
 
-class ClientSyncGetResponse implements \JsonSerializable
+class ClientSyncGetResponse extends Response
 {
   /**
    * @param array<string, int> $deviceOneTimeKeysCount
@@ -24,7 +25,7 @@ class ClientSyncGetResponse implements \JsonSerializable
   )
   {}
 
-  public function jsonSerialize(): array
+  public function getBody(): array
   {
     return array_filter([
       "account_data" => $this->accountData,
@@ -34,6 +35,6 @@ class ClientSyncGetResponse implements \JsonSerializable
       "presence" => $this->presence,
       "rooms" => $this->rooms,
       "to_device" => $this->toDevice,
-    ], "is_null");
+    ], fn ($value) => ! is_null($value));
   }
 }