diff --git a/asm/field_map_obj.s b/asm/field_map_obj.s
index ff3c8c48dc..5801bbc5f3 100644
--- a/asm/field_map_obj.s
+++ b/asm/field_map_obj.s
@@ -5,25 +5,6 @@
 
 	.text
 
-	thumb_func_start npc_clear_ids_and_state
-npc_clear_ids_and_state: @ 808D3F0
-	push {r4,lr}
-	adds r4, r0, 0
-	movs r1, 0
-	movs r2, 0x24
-	bl memset
-	movs r0, 0xFF
-	strb r0, [r4, 0x8]
-	movs r0, 0x1
-	negs r0, r0
-	strb r0, [r4, 0x9]
-	strb r0, [r4, 0xA]
-	strb r0, [r4, 0x1C]
-	pop {r4}
-	pop {r0}
-	bx r0
-	thumb_func_end npc_clear_ids_and_state
-
 	thumb_func_start npcs_clear_ids_and_state
 npcs_clear_ids_and_state: @ 808D410
 	push {r4,r5,lr}
diff --git a/include/global.h b/include/global.h
index c43b57e038..f9c5f68bea 100644
--- a/include/global.h
+++ b/include/global.h
@@ -9,6 +9,11 @@
 // to help in decompiling
 #define asm_comment(x) asm volatile("@ -- " x " -- ")
 
+#ifdef __APPLE__
+void memset(void *, int, size_t);
+void memcpy(void *, const void *, size_t);
+#endif // __APPLE__
+
 #define ARRAY_COUNT(array) (sizeof(array) / sizeof((array)[0]))
 
 #define POKEMON_NAME_LENGTH 10
diff --git a/ld_script.txt b/ld_script.txt
index d0ae744d1e..6e9a7e63c8 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -85,6 +85,7 @@ SECTIONS {
         asm/field_camera.o(.text);
         asm/field_door.o(.text);
         asm/field_player_avatar.o(.text);
+        src/field_map_obj.o(.text);
         asm/field_map_obj.o(.text);
         asm/field_ground_effect.o(.text);
         asm/map_obj_8097404.o(.text);
diff --git a/src/field_map_obj.c b/src/field_map_obj.c
index ec9a7c0029..9451863b4d 100644
--- a/src/field_map_obj.c
+++ b/src/field_map_obj.c
@@ -13,4 +13,11 @@
 
 // Code
 
-
+void npc_clear_ids_and_state(struct MapObject *mapObject)
+{
+    memset(mapObject, 0, sizeof(struct MapObject));
+    mapObject->localId = 0xFF;
+    mapObject->mapNum = -1;
+    mapObject->mapGroup = -1;
+    mapObject->mapobj_unk_1C = -1;
+}