diff --git a/src/dijkstra.rs b/src/dijkstra.rs
index 734f8cf..f4675bb 100644
--- a/src/dijkstra.rs
+++ b/src/dijkstra.rs
@@ -63,7 +63,7 @@ impl<D: Clone + Default> DijkstraMap<D> {
     /// WARNING: Will give incorrect results when used with non-uniform exit costs. Much slower
     /// algorithm required to support that.
     fn build(&mut self, map: &Map<D>) {
-        let mapsize: usize = (self.size_x * self.size_y) as usize;
+        let mapsize = self.size_x * self.size_y;
         let mut open_list: VecDeque<((usize, usize), f32)> = VecDeque::with_capacity(mapsize);
 
         if let Some(pos) = map.starting_point {
diff --git a/src/filter/bsp_rooms.rs b/src/filter/bsp_rooms.rs
index 9c3da49..ec64fe3 100644
--- a/src/filter/bsp_rooms.rs
+++ b/src/filter/bsp_rooms.rs
@@ -110,8 +110,8 @@ impl<D: Clone + Default> BspRooms<D> {
         let rect_width = rect.width();
         let rect_height = rect.height();
 
-        let w = usize::max(3, rng.random_range(1, usize::min(rect_width as usize, 20))) + 1;
-        let h = usize::max(3, rng.random_range(1, usize::min(rect_height as usize, 20))) + 1;
+        let w = usize::max(3, rng.random_range(1, usize::min(rect_width, 20))) + 1;
+        let h = usize::max(3, rng.random_range(1, usize::min(rect_height, 20))) + 1;
 
         result.x1 += rng.random_range(0, 6);
         result.y1 += rng.random_range(0, 6);
@@ -151,7 +151,7 @@ impl<D: Clone + Default> BspRooms<D> {
                     can_build = false;
                 }
                 if can_build {
-                    if let Some(tile) = map.at(x as usize, y as usize) {
+                    if let Some(tile) = map.at(x, y) {
                         if tile.is_walkable() {
                             can_build = false;
                         }
diff --git a/src/filter/maze.rs b/src/filter/maze.rs
index a60ebc0..1105333 100644
--- a/src/filter/maze.rs
+++ b/src/filter/maze.rs
@@ -160,7 +160,7 @@ impl<'a, D: Clone + Default> Grid<'a, D> {
             if neighbors.len() == 1 {
                 return Some(neighbors[0]);
             } else {
-                return Some(neighbors[(self.rng.roll_dice(1, neighbors.len()) - 1) as usize]);
+                return Some(neighbors[(self.rng.roll_dice(1, neighbors.len()) - 1)]);
             }
         }
         None
diff --git a/src/filter/voronoi.rs b/src/filter/voronoi.rs
index ced110a..0d17163 100644
--- a/src/filter/voronoi.rs
+++ b/src/filter/voronoi.rs
@@ -47,7 +47,7 @@ impl<D: Clone + Default> VoronoiHive<D> {
         let seeds = self.generate_seeds(rng, map.width, map.height);
 
         let mut voronoi_distance = vec![(0, 0.0f32); self.n_seeds];
-        let mut voronoi_membership: Vec<i32> = vec![0; map.width as usize * map.height as usize];
+        let mut voronoi_membership: Vec<i32> = vec![0; map.width * map.height];
         for (i, vid) in voronoi_membership.iter_mut().enumerate() {
             let x = i % map.width;
             let y = i / map.width;
diff --git a/src/map.rs b/src/map.rs
index 75b8f6d..c84c762 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -113,8 +113,12 @@ impl<D: Clone + Default> Map<D> {
 
     /// Get TileType at the given location
     pub fn at(&self, x: usize, y: usize) -> Option<&Tile> {
-        let idx = (y as usize) * self.width + (x as usize);
-        self.tiles.get(idx)
+        if x < self.width && y < self.height {
+            let idx = y * self.width + x;
+            self.tiles.get(idx)
+        } else {
+            None
+        }
     }
 
     /// Get available exists from the given tile
@@ -164,7 +168,7 @@ impl<D: Clone + Default> Map<D> {
     /// Modify tile at the given location
     pub fn set_tile(&mut self, x: usize, y: usize, tile: Tile) {
         if x < self.width && y < self.height {
-            let idx = self.xy_idx(x as usize, y as usize);
+            let idx = self.xy_idx(x, y);
             self.tiles[idx] = tile;
         }
     }
@@ -178,7 +182,7 @@ impl<D: Clone + Default> Map<D> {
     pub fn add_room(&mut self, rect: Rect) {
         for x in rect.x1..rect.x2 {
             for y in rect.y1..rect.y2 {
-                self.set_tile(x as usize, y as usize, Tile::floor());
+                self.set_tile(x, y, Tile::floor());
             }
         }
         self.rooms.push(rect);
@@ -279,7 +283,7 @@ impl<D: Clone + Default> fmt::Display for Map<D> {
                 .map(|x| if self.at(x, y).unwrap().is_blocked { '#' } else { ' ' } as u8)
                 .collect();
             let line = String::from_utf8(bytes).expect("Can't convert map to string");
-            let _ = writeln!(f, "{}", line);
+            let _ = writeln!(f, "{line}");
         }
         Ok(())
     }