diff --git a/src/game/data/data_020df0.c b/src/game/data/data_020df0.c
index a2fbbe683..d6cbe7828 100644
--- a/src/game/data/data_020df0.c
+++ b/src/game/data/data_020df0.c
@@ -5672,7 +5672,7 @@ u32 var8007db70 = 0x3f738ef3;
 u32 var8007db74 = 0x00000000;
 u32 var8007db78 = 0x00000000;
 u32 var8007db7c = 0x00000000;
-u32 var8007db80 = 0x00000000;
+f32 var8007db80 = 0;
 f32 var8007db84 = 1;
 u32 var8007db88 = 0x00000000;
 u32 var8007db8c = 0x00000000;
diff --git a/src/game/game_01d990.c b/src/game/game_01d990.c
index cb6cd2c9e..c5e547feb 100644
--- a/src/game/game_01d990.c
+++ b/src/game/game_01d990.c
@@ -9,31 +9,11 @@
 #include "gvars/gvars.h"
 #include "types.h"
 
-GLOBAL_ASM(
-glabel func0f01d990
-/*  f01d990:	3c014580 */ 	lui	$at,0x4580
-/*  f01d994:	44811000 */ 	mtc1	$at,$f2
-/*  f01d998:	3c01800a */ 	lui	$at,0x800a
-/*  f01d99c:	c424a00c */ 	lwc1	$f4,-0x5ff4($at)
-/*  f01d9a0:	3c018008 */ 	lui	$at,0x8008
-/*  f01d9a4:	c426db84 */ 	lwc1	$f6,-0x247c($at)
-/*  f01d9a8:	3c028008 */ 	lui	$v0,%hi(var8007db80)
-/*  f01d9ac:	2442db80 */ 	addiu	$v0,$v0,%lo(var8007db80)
-/*  f01d9b0:	46062202 */ 	mul.s	$f8,$f4,$f6
-/*  f01d9b4:	c44a0000 */ 	lwc1	$f10,0x0($v0)
-/*  f01d9b8:	46085400 */ 	add.s	$f16,$f10,$f8
-/*  f01d9bc:	e4500000 */ 	swc1	$f16,0x0($v0)
-/*  f01d9c0:	c4400000 */ 	lwc1	$f0,0x0($v0)
-/*  f01d9c4:	4600103c */ 	c.lt.s	$f2,$f0
-/*  f01d9c8:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f01d9cc:	45000003 */ 	bc1f	.L0f01d9dc
-/*  f01d9d0:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f01d9d4:	46020481 */ 	sub.s	$f18,$f0,$f2
-/*  f01d9d8:	e4520000 */ 	swc1	$f18,0x0($v0)
-.L0f01d9dc:
-/*  f01d9dc:	03e00008 */ 	jr	$ra
-/*  f01d9e0:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f01d9e4:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f01d9e8:	00000000 */ 	sll	$zero,$zero,0x0
-/*  f01d9ec:	00000000 */ 	sll	$zero,$zero,0x0
-);
+void func0f01d990(void)
+{
+	var8007db80 += g_Vars.lvupdate240freal * var8007db84;
+
+	if (var8007db80 > 4096) {
+		var8007db80 -= 4096;
+	}
+}
diff --git a/src/include/game/data/data_020df0.h b/src/include/game/data/data_020df0.h
index da98ee6e5..f71f8752b 100644
--- a/src/include/game/data/data_020df0.h
+++ b/src/include/game/data/data_020df0.h
@@ -53,7 +53,7 @@ extern struct stagethinglist stagethinglist_22ec8;
 extern struct stagethinglist stagethinglist_22f1c;
 extern struct body g_Bodies[];
 extern u32 var8007dae4;
-extern u32 var8007db80;
+extern f32 var8007db80;
 extern f32 var8007db84;
 extern u32 var8007db88;
 extern u32 var8007db94;