diff --git a/src/server/scripts/Northrend/Gundrak/boss_gal_darah.cpp b/src/server/scripts/Northrend/Gundrak/boss_gal_darah.cpp
index bdabdfddbfb..be62c459251 100644
--- a/src/server/scripts/Northrend/Gundrak/boss_gal_darah.cpp
+++ b/src/server/scripts/Northrend/Gundrak/boss_gal_darah.cpp
@@ -17,6 +17,7 @@
 
 #include "ScriptMgr.h"
 #include "gundrak.h"
+#include "InstanceScript.h"
 #include "ObjectAccessor.h"
 #include "ScriptedCreature.h"
 #include "SpellInfo.h"