diff --git a/src/resources/map.rs b/src/resources/map.rs
index 1d753f9..b9bb6a2 100644
--- a/src/resources/map.rs
+++ b/src/resources/map.rs
@@ -236,6 +236,11 @@ impl Map {
         self.tiles[self.point2d_to_index(point)]
     }
 
+    pub fn get_tile_at_mut(&mut self, point: Point) -> &mut TileType {
+        let index = self.point2d_to_index(point);
+        &mut self.tiles[index]
+    }
+
     pub fn set_tile_at(&mut self, point: Point, tile: TileType) {
         let index = self.point2d_to_index(point);
         self.tiles[index] = tile;
diff --git a/src/systems/monster_ai_system.rs b/src/systems/monster_ai_system.rs
index d2147a6..231f8be 100644
--- a/src/systems/monster_ai_system.rs
+++ b/src/systems/monster_ai_system.rs
@@ -88,10 +88,12 @@ impl<'a> System<'a> for MonsterAiSystem {
                             let _ = entities.delete(*entity);
                         }
                     } else {
-                        match map.get_tile_at(destination) {
+                        let tile = map.get_tile_at_mut(destination);
+                        match tile {
                             TileType::Wall => {}
                             TileType::Block => {
                                 // TODO: Sound
+                                *tile = TileType::Floor;
                                 let _ = entities.delete(*entity);
                             }
                             _ => {