diff --git a/OpenSim/Framework/AgentCircuitData.cs b/OpenSim/Framework/AgentCircuitData.cs
index ffcc5840e8..acf925a408 100644
--- a/OpenSim/Framework/AgentCircuitData.cs
+++ b/OpenSim/Framework/AgentCircuitData.cs
@@ -128,7 +128,30 @@ namespace OpenSim.Framework
         /// <summary>
         /// Viewer's version string as reported by the viewer at login
         /// </summary>
-        public string Viewer;
+        private string ViewerInternal;
+
+        /// <summary>
+        /// Viewer's version string
+        /// </summary>
+        public string Viewer
+        {
+            set { ViewerInternal = value; }
+            // Try to return consistent viewer string taking into account
+            // that viewers have chaagned how version is reported
+            // See http://opensimulator.org/mantis/view.php?id=6851
+            get
+            {
+                // Old style version string contains viewer name followed by a space followed by a version number
+                if (ViewerInternal.Contains(" "))
+                {
+                    return ViewerInternal;
+                }
+                else // New style version contains no spaces, just version number
+                {
+                    return Channel + " " + ViewerInternal;
+                }
+            }
+        }
 
         /// <summary>
         /// The channel strinf sent by the viewer at login