diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9adaf47..f0c42984 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 - Added `Window::is_resizable`.
 - Added `Window::is_decorated`.
 - On X11, fix for repeated event loop iteration when `ControlFlow` was `Wait`
+- On X11, fix scale factor calculation when the only monitor is reconnected
 - On Wayland, report unaccelerated mouse deltas in `DeviceEvent::MouseMotion`.
 - **Breaking:** Bump `ndk` version to 0.6, ndk-sys to `v0.3`, `ndk-glue` to `0.6`.
 - Remove no longer needed `WINIT_LINK_COLORSYNC` environment variable.
diff --git a/src/platform_impl/linux/x11/event_processor.rs b/src/platform_impl/linux/x11/event_processor.rs
index be269ce3..77cc5530 100644
--- a/src/platform_impl/linux/x11/event_processor.rs
+++ b/src/platform_impl/linux/x11/event_processor.rs
@@ -1179,9 +1179,12 @@ impl<T: 'static> EventProcessor<T> {
                                         if monitor.name == new_monitor.name {
                                             let (width, height) = window.inner_size_physical();
                                             let (new_width, new_height) = window.adjust_for_dpi(
-                                                // If there all monitors are closed before, scale
-                                                // factor would be already changed to 1.0.
-                                                maybe_prev_scale_factor.unwrap_or(1.0),
+                                                // If we couldn't determine the previous scale
+                                                // factor (e.g., because all monitors were closed
+                                                // before), just pick whatever the current monitor
+                                                // has set as a baseline.
+                                                maybe_prev_scale_factor
+                                                    .unwrap_or(monitor.scale_factor),
                                                 new_monitor.scale_factor,
                                                 width,
                                                 height,