diff --git a/crates/border-wars/src/camera.rs b/crates/border-wars/src/camera.rs
index c19a3e2..c342cae 100644
--- a/crates/border-wars/src/camera.rs
+++ b/crates/border-wars/src/camera.rs
@@ -107,7 +107,7 @@ fn keyboard_movement_system(
/// Moves the camera with mouse input.
fn mouse_movement_system(
mouse_button_input: Res>,
- mut query: Query<&mut Transform, With>,
+ mut query: Query<(&mut Transform, &OrthographicProjection), With>,
windows: Query<&Window>,
mut last_position: Local