diff --git a/asm/kinstone.s b/asm/kinstone.s
index ed6a123e..98d5f2d4 100644
--- a/asm/kinstone.s
+++ b/asm/kinstone.s
@@ -838,57 +838,3 @@ _08018B28:
 	pop {r3}
 	mov r8, r3
 	pop {r4, r5, r6, r7, pc}
-
-	thumb_func_start sub_08018B50
-sub_08018B50: @ 0x08018B50
-	push {r4, r5, r6, r7, lr}
-	sub sp, #4
-	lsls r1, r0, #2
-	adds r1, r1, r0
-	lsls r1, r1, #2
-	ldr r0, _08018BAC @ =gUnk_080FE320
-	adds r2, r1, r0
-	ldrb r1, [r2, #1]
-	movs r0, #0x80
-	ands r0, r1
-	ldr r3, _08018BB0 @ =0x00000219
-	cmp r0, #0
-	bne _08018B6C
-	subs r3, #0x19
-_08018B6C:
-	ldrh r0, [r2, #8]
-	lsrs r5, r0, #4
-	movs r1, #0x3f
-	ands r5, r1
-	ldrh r0, [r2, #0xa]
-	lsrs r0, r0, #4
-	ands r0, r1
-	lsls r0, r0, #6
-	orrs r5, r0
-	subs r5, #0x82
-	movs r0, #0
-_08018B82:
-	movs r4, #0
-	adds r6, r5, #0
-	adds r6, #0x40
-	adds r7, r0, #1
-_08018B8A:
-	adds r0, r3, #0
-	adds r3, #1
-	adds r1, r5, r4
-	movs r2, #1
-	str r3, [sp]
-	bl SetTileType
-	adds r4, #1
-	ldr r3, [sp]
-	cmp r4, #4
-	bls _08018B8A
-	adds r5, r6, #0
-	adds r0, r7, #0
-	cmp r0, #4
-	bls _08018B82
-	add sp, #4
-	pop {r4, r5, r6, r7, pc}
-	.align 2, 0
-_08018BAC: .4byte gUnk_080FE320
-_08018BB0: .4byte 0x00000219
diff --git a/src/kinstone.c b/src/kinstone.c
index 1c42e02f..ad4e8769 100644
--- a/src/kinstone.c
+++ b/src/kinstone.c
@@ -4,6 +4,31 @@
 #include "common.h"
 #include "flags.h"
 
+void sub_08018B50(int param_1) {
+    u32 i;
+    int iVar2;
+    u32 j;
+    int tilePosition;
+    struct_080FE320* ptr;
+
+    ptr = &gUnk_080FE320[param_1];
+    if ((ptr->entity_idx & 0x80) == 0) {
+        iVar2 = 0x200;
+    } else {
+        iVar2 = 0x219;
+    }
+
+    tilePosition = (ptr->x >> 4) & 0x3f;
+    tilePosition |= ((ptr->y >> 4) & 0x3f) << 6;
+    tilePosition -= 0x82;
+
+    for (i = 0; i < 5; tilePosition += 0x40, i++) {
+        for (j = 0; j < 5; j++) {
+            SetTileType(iVar2++, tilePosition + j, 1);
+        }
+    }
+}
+
 void sub_08018BB4(int param_1) {
     u32 layer;
     TileEntity tile;