diff --git a/wasm/src/lib.rs b/wasm/src/lib.rs
index 17e09fe..c3ea406 100644
--- a/wasm/src/lib.rs
+++ b/wasm/src/lib.rs
@@ -15,7 +15,6 @@ const N: i16 = 100;
 const Z0: Complex<f64> = Complex::new(0.0, 0.0);
 
 const IS_IN: u8 = 255;
-const IS_NOT_IN: u8 = 0;
 
 #[wasm_bindgen]
 impl Mandelbrot {
@@ -88,9 +87,9 @@ fn check_series(x: f64, i: f64) -> u8 {
     let point = Complex::new(x, i);
     let mut num = Z0 + point;
 
-    for _ in 0..N {
+    for i in 0..N {
         if num.norm() >= R as f64 {
-            return IS_NOT_IN;
+            return i as u8;
         }
 
         num = num.powu(2) + point;