diff --git a/src/server/scripts/Outland/HellfireCitadel/BloodFurnace/instance_blood_furnace.cpp b/src/server/scripts/Outland/HellfireCitadel/BloodFurnace/instance_blood_furnace.cpp
index b9d0d101c07..893f97fe711 100644
--- a/src/server/scripts/Outland/HellfireCitadel/BloodFurnace/instance_blood_furnace.cpp
+++ b/src/server/scripts/Outland/HellfireCitadel/BloodFurnace/instance_blood_furnace.cpp
@@ -26,6 +26,7 @@ EndScriptData */
 #include "ScriptMgr.h"
 #include "InstanceScript.h"
 #include "blood_furnace.h"
+#include "CreatureAI.h"
 
 #define ENTRY_SEWER1                 181823
 #define ENTRY_SEWER2                 181766