2 files changed, 3 insertions, 3 deletions
diff --git a/winit/src/multi_window.rs b/winit/src/multi_window.rs
index d7378a1d..ad65e6a5 100644
--- a/winit/src/multi_window.rs
+++ b/winit/src/multi_window.rs
@@ -146,7 +146,7 @@ where
     /// while a scale factor of `0.5` will shrink them to half their size.
     ///
     /// By default, it returns `1.0`.
-    fn scale_factor(&self) -> f64 {
+    fn scale_factor(&self, window: window::Id) -> f64 {
         1.0
     }
 
diff --git a/winit/src/multi_window/state.rs b/winit/src/multi_window/state.rs
index 2c2a4693..35c69924 100644
--- a/winit/src/multi_window/state.rs
+++ b/winit/src/multi_window/state.rs
@@ -36,7 +36,7 @@ where
         window: &Window,
     ) -> Self {
         let title = application.title(window_id);
-        let scale_factor = application.scale_factor();
+        let scale_factor = application.scale_factor(window_id);
         let theme = application.theme();
         let appearance = theme.appearance(&application.style());
 
@@ -199,7 +199,7 @@ where
         }
 
         // Update scale factor
-        let new_scale_factor = application.scale_factor();
+        let new_scale_factor = application.scale_factor(window_id);
 
         if self.scale_factor != new_scale_factor {
             let size = window.inner_size();