diff --git a/asm/kinstone.s b/asm/kinstone.s
index 98d5f2d4..ad29bd8e 100644
--- a/asm/kinstone.s
+++ b/asm/kinstone.s
@@ -804,37 +804,3 @@ _08018ADA:
 	mov r8, r3
 	mov sb, r4
 	pop {r4, r5, r6, r7, pc}
-
-	thumb_func_start sub_08018B10
-sub_08018B10: @ 0x08018B10
-	push {r4, r5, r6, r7, lr}
-	mov r7, r8
-	push {r7}
-	adds r6, r0, #0
-	movs r0, #0xf8
-	lsls r0, r0, #1
-	mov r8, r0
-	movs r7, #0xfe
-	lsls r7, r7, #1
-	movs r5, #0
-	adds r4, r6, #0
-	subs r4, #0x40
-_08018B28:
-	mov r0, r8
-	movs r1, #1
-	add r8, r1
-	adds r1, r6, r5
-	movs r2, #1
-	bl SetTileType
-	adds r0, r7, #0
-	adds r7, #1
-	adds r1, r4, #0
-	movs r2, #2
-	bl SetTileType
-	adds r4, #1
-	adds r5, #1
-	cmp r5, #3
-	bls _08018B28
-	pop {r3}
-	mov r8, r3
-	pop {r4, r5, r6, r7, pc}
diff --git a/src/kinstone.c b/src/kinstone.c
index ad4e8769..f1600ba4 100644
--- a/src/kinstone.c
+++ b/src/kinstone.c
@@ -4,6 +4,22 @@
 #include "common.h"
 #include "flags.h"
 
+void sub_08018B10(int param_1) {
+    int iVar1;
+    u32 index;
+    int iVar3;
+    int iVar4;
+
+    iVar4 = 0x1f0;
+    iVar3 = 0x1fc;
+    index = 0;
+    iVar1 = param_1 - 0x40;
+    for (; index < 4; iVar1++, index++) {
+        SetTileType(iVar4++, param_1 + index, 1);
+        SetTileType(iVar3++, iVar1, 2);
+    }
+}
+
 void sub_08018B50(int param_1) {
     u32 i;
     int iVar2;