diff --git a/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs b/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs
index cb1117ae55..85fb36462a 100644
--- a/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs
+++ b/OpenSim/Framework/Servers/HttpServer/BaseHttpServer.cs
@@ -196,7 +196,8 @@ namespace OpenSim.Framework.Servers.HttpServer
 
         public List<string> GetXmlRpcHandlerKeys()
         {
-            return new List<string>(m_rpcHandlers.Keys);
+            lock (m_rpcHandlers)
+                return new List<string>(m_rpcHandlers.Keys);
         }
 
         public bool AddHTTPHandler(string methodName, GenericHTTPMethod handler)