diff --git a/src/game/UnitAI.h b/src/game/UnitAI.h
index d7b5da086b..9530405ed4 100644
--- a/src/game/UnitAI.h
+++ b/src/game/UnitAI.h
@@ -22,6 +22,7 @@
 #define TRINITY_UNITAI_H
 
 #include "Platform/Define.h"
+#include <list>
 
 class Unit;
 class Player;