diff --git a/server/gameserver/entity.cc b/server/gameserver/entity.cc
index 12e02b2..0a1b301 100644
--- a/server/gameserver/entity.cc
+++ b/server/gameserver/entity.cc
@@ -5,6 +5,7 @@
 #include "room.h"
 #include "building.h"
 #include "human.h"
+#include "app.h"
 
 Entity::Entity()
 {