diff --git a/src/main.rs b/src/main.rs
index 4978703..8625995 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -38,9 +38,11 @@ fn main() {
     let step_digits = format!("{steps}").len();
     for i in 0..steps {
         rng.fill_bytes(&mut rolls);
+
         let GameStep { old, new } = game.step(last, &mut rng, &rolls);
         game = new;
         last = old;
+
         game.write_to_buffer(&mut buffer);
 
         let path = format!("{output_prefix}{i:0OUTPUT_DIGITS$}.png");
@@ -48,6 +50,7 @@ fn main() {
             eprintln!("error saving image: {e}");
             process::exit(1);
         }
+
         eprintln!("step {:step_digits$}/{steps}", i + 1);
     }
 }
@@ -151,7 +154,7 @@ impl Game {
         assert_eq!(self.height as u32, buffer.height());
         for x in 0..self.width {
             for y in 0..self.height {
-                buffer[(x as u32, y as u32)] = self.at(x, y).unwrap().color();
+                buffer.put_pixel(x as u32, y as u32, self.at(x, y).unwrap().color());
             }
         }
     }