diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3388d739..aecad2c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@ Unreleased
 
 ### Breaking:
 
+- Change `TOWER_OPTIMAL_RANGE` and `TOWER_FALLOFF_RANGE` types to `u8` and `TOWER_FALLOFF` type
+  to `f64`
 - Changed `RoomTerrain::new` and `game::map::get_room_terrain` return type to
   `Option<RoomTerrain>`, returning `None` when the specified room is outside the server's
   map
diff --git a/src/constants/numbers.rs b/src/constants/numbers.rs
index 1d0c6b8a..5429a8f6 100644
--- a/src/constants/numbers.rs
+++ b/src/constants/numbers.rs
@@ -398,10 +398,10 @@ pub const TOWER_POWER_HEAL: u32 = 400;
 pub const TOWER_POWER_REPAIR: u32 = 800;
 /// Tower actions at a range beyond this distance suffer falloff penalties - see
 /// [`TOWER_FALLOFF`].
-pub const TOWER_OPTIMAL_RANGE: u32 = 5;
+pub const TOWER_OPTIMAL_RANGE: u8 = 5;
 /// Tower actions at a range greater than or equal to this distance suffer the
 /// maxium falloff penalties - see [`TOWER_FALLOFF`].
-pub const TOWER_FALLOFF_RANGE: u32 = 20;
+pub const TOWER_FALLOFF_RANGE: u8 = 20;
 /// Maximum percentage reduction in healing, repair, and attack effectiveness
 /// for towers due to range.
 ///
@@ -415,7 +415,7 @@ pub const TOWER_FALLOFF_RANGE: u32 = 20;
 /// ```
 ///
 /// [source]: https://github.com/screeps/engine/blob/f02d16a44a00c35615ae227fc72a3c9a07a6a39a/src/processor/intents/towers/attack.js#L38
-pub const TOWER_FALLOFF: f32 = 0.75;
+pub const TOWER_FALLOFF: f64 = 0.75;
 
 /// Initial hits for observer structures; consider using the
 /// [`StructureType::initial_hits`] function.