2 files changed, 9 insertions, 5 deletions
diff --git a/include/constants/maps.h b/include/constants/maps.h
index 2fe255707..f96591f60 100644
--- a/include/constants/maps.h
+++ b/include/constants/maps.h
@@ -464,6 +464,10 @@
 #define MAP_ROUTE124_DIVING_TREASURE_HUNTERS_HOUSE (0 | (33 << 8))
 
 
+#define MAP_NONE (0x7F | (0x7F << 8))
+#define MAP_UNDEFINED (0xFF | (0xFF << 8))
+
+
 #define MAP_GROUP(map) (MAP_##map >> 8)
 #define MAP_NUM(map) (MAP_##map & 0xFF)
 
diff --git a/include/wild_encounter.h b/include/wild_encounter.h
index d4b343126..c9d7c3fa1 100644
--- a/include/wild_encounter.h
+++ b/include/wild_encounter.h
@@ -18,13 +18,13 @@ struct WildPokemonHeader
 {
     u8 mapGroup;
     u8 mapNum;
-    struct WildPokemonInfo *landMonsInfo;
-    struct WildPokemonInfo *waterMonsInfo;
-    struct WildPokemonInfo *rockSmashMonsInfo;
-    struct WildPokemonInfo *fishingMonsInfo;
+    const struct WildPokemonInfo *landMonsInfo;
+    const struct WildPokemonInfo *waterMonsInfo;
+    const struct WildPokemonInfo *rockSmashMonsInfo;
+    const struct WildPokemonInfo *fishingMonsInfo;
 };
 
-extern struct WildPokemonHeader gWildMonHeaders[];
+extern const struct WildPokemonHeader gWildMonHeaders[];
 
 void DisableWildEncounters(bool8 disabled);
 bool8 StandardWildEncounter(u16 a, u16 b);