diff --git a/src/lib/lib_4e470.c b/src/lib/lib_4e470.c
index fda2e39a3..03ef2d31d 100644
--- a/src/lib/lib_4e470.c
+++ b/src/lib/lib_4e470.c
@@ -1,19 +1,6 @@
 #include <ultra64.h>
-#include "constants.h"
-#include "game/data/data_000000.h"
-#include "game/data/data_0083d0.h"
-#include "game/data/data_00e460.h"
-#include "game/data/data_0160b0.h"
-#include "game/data/data_01a3a0.h"
-#include "game/data/data_020df0.h"
-#include "game/data/data_02da90.h"
-#include "gvars/gvars.h"
-#include "types.h"
 
-GLOBAL_ASM(
-glabel osAiGetLength
-/*    4e470:	3c0ea450 */ 	lui	$t6,0xa450
-/*    4e474:	03e00008 */ 	jr	$ra
-/*    4e478:	8dc20004 */ 	lw	$v0,0x4($t6)
-/*    4e47c:	00000000 */ 	nop
-);
+u32 osAiGetLength(void)
+{
+	return IO_READ(AI_LEN_REG);
+}