diff --git a/crates/border-wars/src/responsive_scale.rs b/crates/border-wars/src/responsive_scale.rs
index 8f925f3..1295893 100644
--- a/crates/border-wars/src/responsive_scale.rs
+++ b/crates/border-wars/src/responsive_scale.rs
@@ -10,8 +10,8 @@ const DEFAULT_HEIGHT: f32 = 720.;
 
 /// Calculates the ui_scale.0 depending on the default screen size
 /// in order to make the screen responsive
-pub fn change_scaling(mut ui_scale: ResMut<UiScale>, window: Query<&Window>) {
-    let window = window.single();
+pub fn change_scaling(mut ui_scale: ResMut<UiScale>, windows: Query<&Window>) {
+    let window = windows.get_single().expect("Main window not found");
     let (a, b) = (
         window.resolution.width() / DEFAULT_WIDTH,
         window.resolution.height() / DEFAULT_HEIGHT,