diff --git a/asm/non_matching/color/sub_0801D48C.inc b/asm/non_matching/color/sub_0801D48C.inc
deleted file mode 100644
index 2c51c2f1..00000000
--- a/asm/non_matching/color/sub_0801D48C.inc
+++ /dev/null
@@ -1,71 +0,0 @@
-    .syntax unified
-	push {r4, r5, r6, r7, lr}
-	mov r7, r8
-	push {r7}
-	sub sp, #4
-	adds r6, r0, #0
-	adds r3, r1, #0
-	ldr r0, _0801D50C @ =gPaletteList
-	mov r8, r0
-	lsls r0, r6, #2
-	mov r1, r8
-	adds r4, r0, r1
-	ldrb r0, [r4]
-	lsrs r5, r0, #4
-	subs r5, #1
-	movs r0, #1
-	rsbs r0, r0, #0
-	cmp r5, r0
-	beq _0801D4F8
-	ldr r2, _0801D510 @ =gPaletteBuffer
-	lsls r0, r3, #5
-	movs r1, #0x80
-	lsls r1, r1, #2
-	adds r0, r0, r1
-	adds r7, r0, r2
-	lsls r0, r3, #2
-	add r8, r0
-	lsls r0, r6, #5
-	adds r0, r0, r1
-	adds r6, r0, r2
-	movs r3, #0
-_0801D4C8:
-	ldr r0, [r4]
-	mov r1, r8
-	adds r1, #4
-	mov r8, r1
-	subs r1, #4
-	stm r1!, {r0}
-	strb r3, [r4]
-	strb r3, [r4, #1]
-	strh r3, [r4, #2]
-	adds r0, r6, #0
-	adds r1, r7, #0
-	movs r2, #0x20
-	str r3, [sp]
-	bl MemCopy
-	adds r6, #0x20
-	adds r4, #4
-	adds r7, #0x20
-	subs r5, #1
-	movs r0, #1
-	rsbs r0, r0, #0
-	ldr r3, [sp]
-	cmp r5, r0
-	bne _0801D4C8
-_0801D4F8:
-	ldr r0, _0801D514 @ =gUsedPalettes
-	ldr r1, [r0]
-	ldr r2, _0801D518 @ =0xFFFF0000
-	orrs r1, r2
-	str r1, [r0]
-	add sp, #4
-	pop {r3}
-	mov r8, r3
-	pop {r4, r5, r6, r7, pc}
-	.align 2, 0
-_0801D50C: .4byte gPaletteList
-_0801D510: .4byte gPaletteBuffer
-_0801D514: .4byte gUsedPalettes
-_0801D518: .4byte 0xFFFF0000
-    .syntax divided
diff --git a/src/color.c b/src/color.c
index 3211e948..20c2d321 100644
--- a/src/color.c
+++ b/src/color.c
@@ -289,4 +289,39 @@ u32 sub_0801D458(u32 a1) {
     return 0;
 }
 
-ASM_FUNC("asm/non_matching/color/sub_0801D48C.inc", void sub_0801D48C(u32 a1, u32 a2));
+void sub_0801D48C(u32 a1, u32 a2) {
+    Palette* pPVar1;
+    Palette* pPVar2;
+    s32 iVar2;
+    u16* iVar3;
+    u16* iVar4;
+    Palette* pPVar5;
+    u32 tmp;
+    u16* ptr;
+    Palette* ptr2;
+
+    pPVar2 = gPaletteList;
+    pPVar1 = pPVar2 + a1;
+    iVar2 = (*(u8*)pPVar1) >> 4;
+    if (--iVar2 != -1) {
+        ptr = gPaletteBuffer;
+        iVar4 = ptr + 0x100 + a2 * 0x10;
+        pPVar5 = gPaletteList + a2;
+        iVar3 = ptr + 0x100 + a1 * 0x10;
+        do {
+            *pPVar5 = *pPVar1;
+            pPVar1->_0_0 = 0;
+            pPVar1->_0_4 = 0;
+            pPVar1->_1 = 0;
+            pPVar1->_2 = 0;
+            MemCopy(iVar3, iVar4, 0x20);
+            iVar3 += 0x10;
+            pPVar1++;
+            iVar4 += 0x10;
+            iVar2--;
+            pPVar5++;
+        } while (iVar2 != -1);
+    }
+
+    gUsedPalettes |= 0xffff0000;
+}