diff --git a/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs b/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs
index 40b8c5c1ed..6863e0e37b 100644
--- a/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs
+++ b/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs
@@ -688,7 +688,7 @@ namespace OpenSim.Framework.Servers.HttpServer
 
                 if (buffer != null)
                 {
-                    if (!response.SendChunked)
+                    if (!response.SendChunked && response.ContentLength64 <= 0)
                         response.ContentLength64 = buffer.LongLength;
 
                     response.OutputStream.Write(buffer, 0, buffer.Length);