diff --git a/src/gui.rs b/src/gui.rs
index 04a92bb..1fb6346 100644
--- a/src/gui.rs
+++ b/src/gui.rs
@@ -233,7 +233,7 @@ pub(crate) fn show_main_menu(
         "Welcome to ...",
     );
 
-    for (y, line) in vec![
+    for (y, line) in [
         "########...#######..##....##..######...########",
         "##.....##.##.....##.##....##.##....##..##......",
         "##.....##.##.....##.##....##.##........##......",
diff --git a/src/systems/monster_ai_systems.rs b/src/systems/monster_ai_systems.rs
index 8af930f..e3b45c6 100644
--- a/src/systems/monster_ai_systems.rs
+++ b/src/systems/monster_ai_systems.rs
@@ -34,7 +34,7 @@ pub(crate) fn monster_ai(
 
     ready.sort_by_key(|(_, _, _, energy)| -energy.energy);
 
-    for (entity, mut viewshed, mut pos, mut energy) in ready {
+    for (entity, viewshed, pos, energy) in ready {
         let distance =
             DistanceAlg::Chebyshev.distance2d(Point::new(pos.0.x, pos.0.y), player_pos.into());
         if distance < 1.5 {