diff --git a/Makefile b/Makefile
index 6ffb4b4a..233f3c7d 100644
--- a/Makefile
+++ b/Makefile
@@ -83,6 +83,7 @@ NODEP := 1
 endif
 
 #$(C_BUILDDIR)/need_interworking_file_name.o: CFLAGS += -mthumb-interwork
+$(C_BUILDDIR)/code_080B1520.o: CFLAGS += -mthumb-interwork
 
 C_SRCS := $(wildcard $(C_SUBDIR)/*.c $(C_SUBDIR)/*/*.c)
 C_OBJS := $(patsubst $(C_SUBDIR)/%.c,$(C_BUILDDIR)/%.o,$(C_SRCS))
diff --git a/asm/code_080B1520.s b/asm/code_080B1520.s
index 9ecbe88a..6a90c190 100644
--- a/asm/code_080B1520.s
+++ b/asm/code_080B1520.s
@@ -5,44 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_080B1520
-sub_080B1520: @ 0x080B1520
-	push {lr}
-	lsls r0, r0, #0x10
-	lsrs r0, r0, #0x10
-	movs r2, #0
-	cmp r0, #4
-	bne _080B153C
-	ldr r1, _080B1534 @ =gUnk_02036A50
-	ldr r0, _080B1538 @ =gUnk_08DE7D40
-	str r0, [r1]
-	b _080B1558
-	.align 2, 0
-_080B1534: .4byte gUnk_02036A50
-_080B1538: .4byte gUnk_08DE7D40
-_080B153C:
-	cmp r0, #0x40
-	bne _080B1550
-	ldr r1, _080B1548 @ =gUnk_02036A50
-	ldr r0, _080B154C @ =gUnk_08DE7D4C
-	str r0, [r1]
-	b _080B1558
-	.align 2, 0
-_080B1548: .4byte gUnk_02036A50
-_080B154C: .4byte gUnk_08DE7D4C
-_080B1550:
-	ldr r1, _080B1560 @ =gUnk_02036A50
-	ldr r0, _080B1564 @ =gUnk_08DE7D40
-	str r0, [r1]
-	movs r2, #1
-_080B1558:
-	adds r0, r2, #0
-	pop {r1}
-	bx r1
-	.align 2, 0
-_080B1560: .4byte gUnk_02036A50
-_080B1564: .4byte gUnk_08DE7D40
-
 	thumb_func_start sub_080B1568
 sub_080B1568: @ 0x080B1568
 	push {r4, r5, r6, lr}
diff --git a/asm/non_matching/code_080B1520/sub_080B1568.inc b/asm/non_matching/code_080B1520/sub_080B1568.inc
new file mode 100644
index 00000000..2c79cd29
--- /dev/null
+++ b/asm/non_matching/code_080B1520/sub_080B1568.inc
@@ -0,0 +1,62 @@
+    .syntax unified
+    .text
+	push {r4, r5, r6, lr}
+	lsls r2, r2, #0x10
+	lsrs r2, r2, #0x10
+	ldr r4, _080B15C8 @ =0x04000208
+	ldrh r3, [r4]
+	adds r6, r3, #0
+	movs r3, #0
+	strh r3, [r4]
+	ldr r5, _080B15CC @ =0x04000204
+	ldrh r4, [r5]
+	ldr r3, _080B15D0 @ =0x0000F8FF
+	ands r4, r3
+	ldr r3, _080B15D4 @ =gUnk_02036A50
+	ldr r3, [r3]
+	ldrh r3, [r3, #6]
+	orrs r4, r3
+	strh r4, [r5]
+	ldr r3, _080B15D8 @ =0x040000D4
+	str r0, [r3]
+	ldr r0, _080B15DC @ =0x040000D8
+	str r1, [r0]
+	ldr r1, _080B15E0 @ =0x040000DC
+	movs r0, #0x80
+	lsls r0, r0, #0x18
+	orrs r2, r0
+	str r2, [r1]
+	adds r1, #2
+	movs r2, #0x80
+	lsls r2, r2, #8
+	adds r0, r2, #0
+	ldrh r1, [r1]
+	ands r0, r1
+	cmp r0, #0
+	beq _080B15BC
+	ldr r2, _080B15E4 @ =0x040000DE
+	movs r0, #0x80
+	lsls r0, r0, #8
+	adds r1, r0, #0
+_080B15B4:
+	ldrh r0, [r2]
+	ands r0, r1
+	cmp r0, #0
+	bne _080B15B4
+_080B15BC:
+	ldr r0, _080B15C8 @ =0x04000208
+	strh r6, [r0]
+	pop {r4, r5, r6}
+	pop {r0}
+	bx r0
+	.align 2, 0
+_080B15C8: .4byte 0x04000208
+_080B15CC: .4byte 0x04000204
+_080B15D0: .4byte 0x0000F8FF
+_080B15D4: .4byte gUnk_02036A50
+_080B15D8: .4byte 0x040000D4
+_080B15DC: .4byte 0x040000D8
+_080B15E0: .4byte 0x040000DC
+_080B15E4: .4byte 0x040000DE
+
+    .syntax divided
\ No newline at end of file
diff --git a/linker.ld b/linker.ld
index 0267d7cd..4cfa3dfc 100644
--- a/linker.ld
+++ b/linker.ld
@@ -899,6 +899,7 @@ SECTIONS {
         asm/m4a_asm.o(.text);
         asm/m4a.o(.text);
         asm/libagbsyscall.o(.text);
+        src/code_080B1520.o(.text);
         asm/code_080B1520.o(.text);
         *libc.a:memcpy.o(.text);
 
diff --git a/src/code_080B1520.c b/src/code_080B1520.c
new file mode 100644
index 00000000..8f461ced
--- /dev/null
+++ b/src/code_080B1520.c
@@ -0,0 +1,23 @@
+#include "global.h"
+
+extern u16 (*gUnk_02036A50)[];
+extern u16 gUnk_08DE7D40[];
+extern u16 gUnk_08DE7D4C[];
+
+u32 sub_080B1520(u16 unk_1) {
+    u32 ret;
+
+    ret = 0;
+    if (unk_1 == 4) {
+        gUnk_02036A50 = &gUnk_08DE7D40;
+    } else {
+        if (unk_1 == 0x40) {
+            gUnk_02036A50 = &gUnk_08DE7D4C;
+        } else {
+            gUnk_02036A50 = &gUnk_08DE7D40;
+            ret = 1;
+        }
+    }
+    return ret;
+}
+