diff --git a/src/ant.rs b/src/ant.rs
index 53130c8..47895ef 100644
--- a/src/ant.rs
+++ b/src/ant.rs
@@ -6,6 +6,7 @@ use macroquad::prelude::*;
 use macroquad::rand::RandomRange;
 use std::f32::consts::PI;
 
+#[derive(Debug)]
 pub(crate) struct Ant {
     pos: Vec2,
     dir: f32,
@@ -31,9 +32,8 @@ impl Ant {
 
         let acceleration = Vec2::new(self.dir.sin(), -self.dir.cos());
         self.pos += acceleration * ANT_SPEED * frame_time;
-        // TODO: this is not fixing out of bounds write
-        self.pos.x = self.pos.x.clamp(0., MAP_WIDTH as f32);
-        self.pos.y = self.pos.y.clamp(0., MAP_HEIGHT as f32);
+        self.pos.x = self.pos.x.clamp(0., (MAP_WIDTH - 1) as f32);
+        self.pos.y = self.pos.y.clamp(0., (MAP_HEIGHT - 1) as f32);
 
         // TODO: change color over time
         trail_map.set_pixel(self.pos.x as u32, self.pos.y as u32, RED);