diff --git a/asm/kinstone.s b/asm/kinstone.s
index 37325da0..fd6f8de5 100644
--- a/asm/kinstone.s
+++ b/asm/kinstone.s
@@ -258,19 +258,3 @@ sub_080186C0: @ 0x080186C0
 	bx lr
 	.align 2, 0
 _080186D0: .4byte gArea
-
-	thumb_func_start sub_080186D4
-sub_080186D4: @ 0x080186D4
-	push {lr}
-	ldr r0, _080186E8 @ =gArea
-	adds r0, #0x28
-	ldrb r0, [r0]
-	cmp r0, #0xff
-	bne _080186E4
-	bl sub_0801855C
-_080186E4:
-	pop {pc}
-	.align 2, 0
-_080186E8: .4byte gArea
-
-
diff --git a/src/kinstone.c b/src/kinstone.c
index 80a3701f..8ec8d54e 100644
--- a/src/kinstone.c
+++ b/src/kinstone.c
@@ -5,6 +5,8 @@
 #include "flags.h"
 #include "player.h"
 #include "kinstone.h"
+#include "area.h"
+#include "manager.h"
 
 extern EntityData gUnk_080FEC28[];
 extern EntityData gUnk_080FEBE8[];
@@ -26,6 +28,12 @@ void sub_080189EC(int);
 void sub_0801876C(int, int);
 void sub_08018738(u32, int);
 
+void sub_080186D4(void) {
+    if (gArea.inventoryGfxIdx == 0xff) {
+        sub_0801855C();
+    }
+}
+
 void sub_080186EC(u32 param_1) {
     struct_080C9CBC* psVar1;
     u32 i;