diff --git a/backend/src/Squidex.Domain.Apps.Entities.MongoDb/Assets/MongoAssetEntity.cs b/backend/src/Squidex.Domain.Apps.Entities.MongoDb/Assets/MongoAssetEntity.cs
index 70b45ba0a..ac0c80a61 100644
--- a/backend/src/Squidex.Domain.Apps.Entities.MongoDb/Assets/MongoAssetEntity.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities.MongoDb/Assets/MongoAssetEntity.cs
@@ -72,6 +72,10 @@ namespace Squidex.Domain.Apps.Entities.MongoDb.Assets
         [BsonElement("vs")]
         public long Version { get; set; }
 
+        [BsonRequired]
+        [BsonElement("ts")]
+        public long TotalSize { get; set; }
+
         [BsonRequired]
         [BsonElement("at")]
         public AssetType Type { get; set; }