diff --git a/src/game/ObjectGuid.cpp b/src/game/ObjectGuid.cpp
index eefc901..c297263 100644
--- a/src/game/ObjectGuid.cpp
+++ b/src/game/ObjectGuid.cpp
@@ -37,6 +37,7 @@ char const* ObjectGuid::GetTypeName(HighGuid high)
         case HIGHGUID_DYNAMICOBJECT:return "DynObject";
         case HIGHGUID_CORPSE:       return "Corpse";
         case HIGHGUID_MO_TRANSPORT: return "MoTransport";
+        case HIGHGUID_INSTANCE:     return "InstanceID";
         default:
             return "<unknown>";
     }
@@ -105,3 +106,4 @@ template uint32 ObjectGuidGenerator<HIGHGUID_PET>::Generate();
 template uint32 ObjectGuidGenerator<HIGHGUID_VEHICLE>::Generate();
 template uint32 ObjectGuidGenerator<HIGHGUID_DYNAMICOBJECT>::Generate();
 template uint32 ObjectGuidGenerator<HIGHGUID_CORPSE>::Generate();
+//template uint32 ObjectGuidGenerator<HIGHGUID_INSTANCE>::Generate(); Currently not used
diff --git a/src/game/ObjectGuid.h b/src/game/ObjectGuid.h
index 4fc9bb0..b86483c 100644
--- a/src/game/ObjectGuid.h
+++ b/src/game/ObjectGuid.h
@@ -72,6 +72,7 @@ enum HighGuid
     HIGHGUID_DYNAMICOBJECT  = 0xF100,                       // blizz F100/F500
     HIGHGUID_CORPSE         = 0xF500,                       // blizz F100/F500 used second variant to resolve conflict with HIGHGUID_DYNAMICOBJECT
     HIGHGUID_MO_TRANSPORT   = 0x1FC0,                       // blizz 1FC0 (for GAMEOBJECT_TYPE_MO_TRANSPORT)
+    HIGHGUID_INSTANCE       = 0x1F42,                       // blizz 1F42
 };

 //*** Must be replaced by ObjectGuid use ***
@@ -92,6 +93,7 @@ inline bool IsGuidHaveEnPart(uint64 const& guid)
         case HIGHGUID_DYNAMICOBJECT:
         case HIGHGUID_CORPSE:
         case HIGHGUID_MO_TRANSPORT:
+        case HIGHGUID_INSTANCE:
             return false;
         case HIGHGUID_GAMEOBJECT:
         case HIGHGUID_TRANSPORT:
@@ -170,6 +172,7 @@ class MANGOS_DLL_SPEC ObjectGuid
         bool IsCorpse()        const { return GetHigh() == HIGHGUID_CORPSE; }
         bool IsTransport()     const { return GetHigh() == HIGHGUID_TRANSPORT; }
         bool IsMOTransport()   const { return GetHigh() == HIGHGUID_MO_TRANSPORT; }
+        bool IsInstance()      const { return GetHigh() == HIGHGUID_INSTANCE; }

         static TypeID GetTypeId(HighGuid high)
         {
@@ -186,6 +189,7 @@ class MANGOS_DLL_SPEC ObjectGuid
                 case HIGHGUID_MO_TRANSPORT: return TYPEID_GAMEOBJECT;
                 case HIGHGUID_VEHICLE:      return TYPEID_UNIT;
                 // unknown
+                case HIGHGUID_INSTANCE:
                 default:                    return TYPEID_OBJECT;
             }
         }
@@ -211,6 +215,7 @@ class MANGOS_DLL_SPEC ObjectGuid
                 case HIGHGUID_DYNAMICOBJECT:
                 case HIGHGUID_CORPSE:
                 case HIGHGUID_MO_TRANSPORT:
+                case HIGHGUID_INSTANCE:
                     return false;
                 case HIGHGUID_GAMEOBJECT:
                 case HIGHGUID_TRANSPORT:
diff --git a/src/game/ObjectMgr.cpp b/src/game/ObjectMgr.cpp
index ccd8382..2dc5efe 100644
--- a/src/game/ObjectMgr.cpp
+++ b/src/game/ObjectMgr.cpp
@@ -6265,6 +6265,8 @@ uint32 ObjectMgr::GenerateLowGuid(HighGuid guidhigh)
             return m_GameobjectGuids.Generate();
         case HIGHGUID_CORPSE:
             return m_CorpseGuids.Generate();
+        //case HIGHGUID_INSTANCE:   Currently not used
+        //    return m_InstanceGuids.Generate();
         default:
             MANGOS_ASSERT(0);
     }
diff --git a/src/game/ObjectMgr.h b/src/game/ObjectMgr.h
index 19285d9..a52c688 100644
--- a/src/game/ObjectMgr.h
+++ b/src/game/ObjectMgr.h
@@ -1299,6 +1299,7 @@ class ObjectMgr
         ObjectGuidGenerator<HIGHGUID_ITEM>       m_ItemGuids;
         ObjectGuidGenerator<HIGHGUID_GAMEOBJECT> m_GameobjectGuids;
         ObjectGuidGenerator<HIGHGUID_CORPSE>     m_CorpseGuids;
+        //ObjectGuidGenerator<HIGHGUID_INSTANCE>   m_InstanceGuids; Currently not used

         QuestMap            mQuestTemplates;