diff --git a/src/server/scripts/Northrend/Ulduar/ulduar/ulduar_teleporter.cpp b/src/server/scripts/Northrend/Ulduar/ulduar/ulduar_teleporter.cpp
index 3c7feb8052..aa79edbe2f 100644
--- a/src/server/scripts/Northrend/Ulduar/ulduar/ulduar_teleporter.cpp
+++ b/src/server/scripts/Northrend/Ulduar/ulduar/ulduar_teleporter.cpp
@@ -19,6 +19,7 @@
 #include "ScriptMgr.h"
 #include "ScriptedGossip.h"
 #include "ulduar.h"
+#include "InstanceScript.h"
 
 /*
 The teleporter appears to be active and stable.