diff --git a/asm/enemy/gleerok.s b/asm/enemy/gleerok.s
index dd341326..5c60ac94 100644
--- a/asm/enemy/gleerok.s
+++ b/asm/enemy/gleerok.s
@@ -6,35 +6,6 @@
 
 	.text
 
-
-	thumb_func_start sub_0802EA18
-sub_0802EA18: @ 0x0802EA18
-	push {lr}
-	adds r3, r2, #0
-	movs r2, #0x80
-	lsls r2, r2, #5
-	adds r1, r1, r2
-	subs r1, r1, r0
-	ldr r0, _0802EA40 @ =0x00001FFF
-	ands r1, r0
-	lsls r3, r3, #8
-	subs r2, r2, r3
-	cmp r1, r2
-	blo _0802EA44
-	movs r2, #0x80
-	lsls r2, r2, #5
-	adds r0, r3, r2
-	cmp r1, r0
-	bhi _0802EA44
-	movs r0, #0
-	b _0802EA46
-	.align 2, 0
-_0802EA40: .4byte 0x00001FFF
-_0802EA44:
-	movs r0, #1
-_0802EA46:
-	pop {pc}
-
 	thumb_func_start sub_0802EA48
 sub_0802EA48: @ 0x0802EA48
 	push {r4, lr}
diff --git a/src/enemy/gleerok.c b/src/enemy/gleerok.c
index bdafc0a8..e6fa9f9b 100644
--- a/src/enemy/gleerok.c
+++ b/src/enemy/gleerok.c
@@ -70,7 +70,7 @@ extern void sub_0802EBC4(GleerokEntity* this);
 extern void sub_0802E9B0(GleerokEntity* this);
 
 extern bool32 sub_0802EB08(Gleerok_HeapStruct* param_1, u32 param_2, u32 param_3);
-extern bool32 sub_0802EA18(u16 param_1, u16 param_2, u32 param_3);
+extern bool32 sub_0802EA18(u32 param_1, u32 param_2, u32 param_3);
 extern bool32 sub_0802EA48(Gleerok_HeapStruct* param_1, u32 param_2, u32 param_3, u32 param_4);
 extern bool32 sub_0802EA68(Gleerok_HeapStruct* param_1, u32 param_2, u32 param_3, u32 param_4);
 extern bool32 sub_0802E7CC(Gleerok_HeapStruct* param_1, u32 param_2, u32 param_3, u32 param_4);
@@ -1287,3 +1287,19 @@ void sub_0802E9B0(GleerokEntity* this) {
         }
     }
 }
+
+bool32 sub_0802EA18(u32 arg0, u32 arg1, u32 arg2) {
+    u32 r1;
+
+    r1 = arg1 + 0x1000;
+    r1 -= arg0;
+    r1 &= 0x1FFF;
+    arg2 <<= 8;
+
+    if (r1 >= 0x1000 - arg2) {
+        if (r1 <= 0x1000 + arg2) {
+            return FALSE;
+        }
+    }
+    return TRUE;
+}