diff --git a/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp b/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
index 119dce548cf..0bfae1f4082 100644
--- a/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
+++ b/src/server/game/AI/SmartScripts/SmartScriptMgr.cpp
@@ -29,6 +29,7 @@
 #include "SpellMgr.h"
 #include "Timer.h"
 #include "UnitDefines.h"
+#include "Unit.h"
 #include "WaypointDefines.h"
 
 SmartWaypointMgr* SmartWaypointMgr::instance()