diff --git a/Remora.Rest/Extensions/JsonExtensions.cs b/Remora.Rest/Extensions/JsonExtensions.cs
index df260cf..20fa74b 100644
--- a/Remora.Rest/Extensions/JsonExtensions.cs
+++ b/Remora.Rest/Extensions/JsonExtensions.cs
@@ -34,6 +34,8 @@ public static class JsonExtensions
         using var writer = new Utf8JsonWriter(bufferWriter);
         element.WriteTo(writer);
 
+        writer.Flush();
+
         return JsonSerializer.Deserialize<TEntity>(bufferWriter.WrittenSpan, options);
     }