diff --git a/src/server/game/AuctionHouse/AuctionHouseMgr.h b/src/server/game/AuctionHouse/AuctionHouseMgr.h
index 265272af0..e2e275ac9 100644
--- a/src/server/game/AuctionHouse/AuctionHouseMgr.h
+++ b/src/server/game/AuctionHouse/AuctionHouseMgr.h
@@ -13,6 +13,7 @@
 #include "EventProcessor.h"
 #include "ObjectGuid.h"
 #include "WorldPacket.h"
+#include <unordered_map>
 
 class Item;
 class Player;
diff --git a/src/server/game/Calendar/CalendarMgr.cpp b/src/server/game/Calendar/CalendarMgr.cpp
index f3061775c..b8a9ae236 100644
--- a/src/server/game/Calendar/CalendarMgr.cpp
+++ b/src/server/game/Calendar/CalendarMgr.cpp
@@ -11,6 +11,7 @@
 #include "Opcodes.h"
 #include "Player.h"
 #include "QueryResult.h"
+#include <unordered_map>
 
 CalendarInvite::~CalendarInvite()
 {
diff --git a/src/server/game/Calendar/CalendarMgr.h b/src/server/game/Calendar/CalendarMgr.h
index b42cd7922..4049f1c10 100644
--- a/src/server/game/Calendar/CalendarMgr.h
+++ b/src/server/game/Calendar/CalendarMgr.h
@@ -11,6 +11,7 @@
 #include "DatabaseEnv.h"
 #include "WorldPacket.h"
 #include "ObjectGuid.h"
+#include <unordered_map>
 
 enum CalendarMailAnswers
 {
diff --git a/src/server/game/Entities/Item/ItemTemplate.h b/src/server/game/Entities/Item/ItemTemplate.h
index ba0f10d02..f11b3fc72 100644
--- a/src/server/game/Entities/Item/ItemTemplate.h
+++ b/src/server/game/Entities/Item/ItemTemplate.h
@@ -10,6 +10,7 @@
 #include "Common.h"
 #include "SharedDefines.h"
 #include "WorldPacket.h"
+#include <unordered_map>
 
 enum ItemModType
 {
diff --git a/src/server/game/World/IWorld.h b/src/server/game/World/IWorld.h
index 5ee43f23e..e1e2ea535 100644
--- a/src/server/game/World/IWorld.h
+++ b/src/server/game/World/IWorld.h
@@ -15,6 +15,7 @@
 #include <list>
 #include <map>
 #include <set>
+#include <unordered_map>
 
 class WorldPacket;
 class WorldSession;
diff --git a/src/server/game/World/World.h b/src/server/game/World/World.h
index bb432e417..28c8244b1 100644
--- a/src/server/game/World/World.h
+++ b/src/server/game/World/World.h
@@ -21,6 +21,7 @@
 #include <list>
 #include <map>
 #include <set>
+#include <unordered_map>
 
 class Object;
 class WorldPacket;