diff --git a/Src/Notion.Client/Models/Blocks/Request/SyncedBlockBlockRequest.cs b/Src/Notion.Client/Models/Blocks/Request/SyncedBlockBlockRequest.cs
index 5338e5b..dd27a77 100644
--- a/Src/Notion.Client/Models/Blocks/Request/SyncedBlockBlockRequest.cs
+++ b/Src/Notion.Client/Models/Blocks/Request/SyncedBlockBlockRequest.cs
@@ -12,7 +12,7 @@ public class SyncedBlockBlockRequest : BlockObjectRequest, IColumnChildrenBlockR
 
         public class Data
         {
-            [JsonProperty("synced_from")]
+            [JsonProperty("synced_from", NullValueHandling = NullValueHandling.Include)]
             public SyncedFromBlockId SyncedFrom { get; set; }
 
             [JsonProperty("children")]