diff --git a/src/Api/Models/SendFileModel.cs b/src/Api/Models/SendFileModel.cs
index b39aa33ea..653510c89 100644
--- a/src/Api/Models/SendFileModel.cs
+++ b/src/Api/Models/SendFileModel.cs
@@ -21,7 +21,7 @@ namespace Bit.Api.Models
         [EncryptedStringLength(1000)]
         public string FileName { get; set; }
         [JsonNumberHandling(JsonNumberHandling.AllowReadingFromString | JsonNumberHandling.WriteAsString)]
-        public long Size { get; set; }
+        public long? Size { get; set; }
         public string SizeName { get; set; }
     }
 }