diff --git a/src/server/scripts/Outland/BlackTemple/boss_illidan.cpp b/src/server/scripts/Outland/BlackTemple/boss_illidan.cpp
index b8b6c402922..8cfd43ac8f1 100644
--- a/src/server/scripts/Outland/BlackTemple/boss_illidan.cpp
+++ b/src/server/scripts/Outland/BlackTemple/boss_illidan.cpp
@@ -20,6 +20,7 @@
 #include "ScriptedGossip.h"
 #include "PassiveAI.h"
 #include "black_temple.h"
+#include "InstanceScript.h"
 #include "Player.h"
 #include "SpellInfo.h"
 #include "SpellScript.h"