diff --git a/src/map/mob.c b/src/map/mob.c
index f8e608699b..2ff7176b83 100644
--- a/src/map/mob.c
+++ b/src/map/mob.c
@@ -2989,7 +2989,7 @@ int mob_clone_delete(int class_)
 	return 0;
 }
 
-int mob_script_callback(struct mob_data *md, struct block_list *target, unsigned char action_type)
+int mob_script_callback(struct mob_data *md, struct block_list *target, short action_type)
 {
 	// I will not add any protection here since I assume everything is checked before coming here.
 	if(md->callback_flag&action_type){
diff --git a/src/map/mob.h b/src/map/mob.h
index c4f27f08e6..4c83e14c60 100644
--- a/src/map/mob.h
+++ b/src/map/mob.h
@@ -36,7 +36,7 @@
 #define CALLBACK_WALKACK	0x02
 #define CALLBACK_WARPACK	0x01
 
-int mob_script_callback(struct mob_data *md, struct block_list *target, unsigned char action_type);
+int mob_script_callback(struct mob_data *md, struct block_list *target, short action_type);
 
 struct mob_skill {
 	short state;