diff --git a/OpenSim/Data/IRegionData.cs b/OpenSim/Data/IRegionData.cs
index b8de1d89e0..41c74f251a 100644
--- a/OpenSim/Data/IRegionData.cs
+++ b/OpenSim/Data/IRegionData.cs
@@ -70,6 +70,7 @@ namespace OpenSim.Data
         DefaultRegion = 1, // Used for new Rez. Random if multiple defined
         FallbackRegion = 2, // Regions we redirect to when the destination is down
         RegionOnline = 4, // Set when a region comes online, unset when it unregisters and DeleteOnUnregister is false
-        NoDirectLogin = 8 // Region unavailable for direct logins (by name)
+        NoDirectLogin = 8, // Region unavailable for direct logins (by name)
+        Persistent = 16 // Don't remove on unregister
     }
 }
diff --git a/OpenSim/Services/GridService/GridService.cs b/OpenSim/Services/GridService/GridService.cs
index 9bf986ecfa..66bbff037d 100644
--- a/OpenSim/Services/GridService/GridService.cs
+++ b/OpenSim/Services/GridService/GridService.cs
@@ -156,13 +156,14 @@ namespace OpenSim.Services.GridService
         public bool DeregisterRegion(UUID regionID)
         {
             m_log.DebugFormat("[GRID SERVICE]: Region {0} deregistered", regionID);
-            if (!m_DeleteOnUnregister)
-            {
-                RegionData region = m_Database.Get(regionID, UUID.Zero);
-                if (region == null)
-                    return false;
+            RegionData region = m_Database.Get(regionID, UUID.Zero);
+            if (region == null)
+                return false;
 
-                int flags = Convert.ToInt32(region.Data["flags"]);
+            int flags = Convert.ToInt32(region.Data["flags"]);
+
+            if (!m_DeleteOnUnregister || (flags & (int)OpenSim.Data.RegionFlags.Persistent) != 0)
+            {
                 flags &= ~(int)OpenSim.Data.RegionFlags.RegionOnline;
                 region.Data["flags"] = flags.ToString();
                 region.Data["last_seen"] = Util.UnixTimeSinceEpoch();