1 files changed, 1 insertions, 1 deletions
diff --git a/matrix-specification/Data/DiscoveryInformation.php b/matrix-specification/Data/DiscoveryInformation.php
index 42a3dc2..f4eda64 100644
--- a/matrix-specification/Data/DiscoveryInformation.php
+++ b/matrix-specification/Data/DiscoveryInformation.php
@@ -24,7 +24,7 @@ class DiscoveryInformation implements \JsonSerializable
         ],
         $this->otherProperties ?? [],
       ),
-      "is_null"
+      fn ($value) => ! is_null($value)
     );
   }
 }