diff --git a/Realm/Realm/Native/SyncSocketProvider.WebSocket.cs b/Realm/Realm/Native/SyncSocketProvider.WebSocket.cs
index 5aa91cc81..522a1e7a3 100644
--- a/Realm/Realm/Native/SyncSocketProvider.WebSocket.cs
+++ b/Realm/Realm/Native/SyncSocketProvider.WebSocket.cs
@@ -124,7 +124,7 @@ public async void Write(BinaryValue data, IntPtr native_callback)
 
             try
             {
-                await _webSocket.SendAsync(new(buffer), WebSocketMessageType.Binary, true, _cancellationToken);
+                await _webSocket.SendAsync(new(buffer, 0, (int)data.size), WebSocketMessageType.Binary, true, _cancellationToken);
             }
             catch (Exception e)
             {