diff --git a/src/include/lib/lib_13900.h b/src/include/lib/lib_13900.h
index 5aa5a8cc3..f0d0e5dc7 100644
--- a/src/include/lib/lib_13900.h
+++ b/src/include/lib/lib_13900.h
@@ -42,7 +42,7 @@ void func00015144(void);
 u32 func0001519c(void);
 u32 func000152d0(void);
 u32 func000153c4(void);
-bool func000155b4(u32 arg0);
+bool func000155b4(s8 index);
 u32 func000155f4(void);
 u32 func0001561c(void);
 
diff --git a/src/lib/lib_13900.c b/src/lib/lib_13900.c
index 194fac22e..1e1e07ca5 100644
--- a/src/lib/lib_13900.c
+++ b/src/lib/lib_13900.c
@@ -1587,25 +1587,10 @@ glabel func000153c4
 /*    155b0:	00000000 */ 	nop
 );
 
-GLOBAL_ASM(
-glabel func000155b4
-/*    155b4:	00047600 */ 	sll	$t6,$a0,0x18
-/*    155b8:	000e7e03 */ 	sra	$t7,$t6,0x18
-/*    155bc:	000fc080 */ 	sll	$t8,$t7,0x2
-/*    155c0:	030fc023 */ 	subu	$t8,$t8,$t7
-/*    155c4:	0018c080 */ 	sll	$t8,$t8,0x2
-/*    155c8:	030fc023 */ 	subu	$t8,$t8,$t7
-/*    155cc:	0018c080 */ 	sll	$t8,$t8,0x2
-/*    155d0:	030fc021 */ 	addu	$t8,$t8,$t7
-/*    155d4:	0018c080 */ 	sll	$t8,$t8,0x2
-/*    155d8:	030fc023 */ 	subu	$t8,$t8,$t7
-/*    155dc:	0018c080 */ 	sll	$t8,$t8,0x2
-/*    155e0:	3c02800a */ 	lui	$v0,%hi(var800a2380+0x10)
-/*    155e4:	00581021 */ 	addu	$v0,$v0,$t8
-/*    155e8:	afa40000 */ 	sw	$a0,0x0($sp)
-/*    155ec:	03e00008 */ 	jr	$ra
-/*    155f0:	8c422390 */ 	lw	$v0,%lo(var800a2380+0x10)($v0)
-);
+bool func000155b4(s8 index)
+{
+	return var800a2380[index].unk010;
+}
 
 GLOBAL_ASM(
 glabel func000155f4