diff --git a/src/game/Entities/Pet.h b/src/game/Entities/Pet.h
index 769e6146135..6b12fad0a6b 100644
--- a/src/game/Entities/Pet.h
+++ b/src/game/Entities/Pet.h
@@ -23,6 +23,7 @@
 #include "Entities/ObjectGuid.h"
 #include "Entities/Creature.h"
 #include "Entities/Unit.h"
+#include "Maps/InstanceData.h"
 
 enum PetType
 {