diff --git a/imgui-winit-support/src/lib.rs b/imgui-winit-support/src/lib.rs
index ef3847c..7460588 100644
--- a/imgui-winit-support/src/lib.rs
+++ b/imgui-winit-support/src/lib.rs
@@ -967,6 +967,13 @@ impl WinitPlatform {
                     _ => (),
                 }
             }
+            WindowEvent::Focused(newly_focused) => {
+                if !newly_focused {
+                    // Set focus-lost to avoid stuck keys (like 'alt'
+                    // when alt-tabbing)
+                    io.app_focus_lost = true;
+                }
+            }
             _ => (),
         }
     }
@@ -1077,6 +1084,13 @@ impl WinitPlatform {
                     _ => (),
                 }
             }
+            WindowEvent::Focused(newly_focused) => {
+                if !newly_focused {
+                    // Set focus-lost to avoid stuck keys (like 'alt'
+                    // when alt-tabbing)
+                    io.app_focus_lost = true;
+                }
+            }
             _ => (),
         }
     }
@@ -1186,6 +1200,13 @@ impl WinitPlatform {
                     _ => (),
                 }
             }
+            WindowEvent::Focused(newly_focused) => {
+                if !newly_focused {
+                    // Set focus-lost to avoid stuck keys (like 'alt'
+                    // when alt-tabbing)
+                    io.app_focus_lost = true;
+                }
+            }
             _ => (),
         }
     }
diff --git a/imgui/src/io.rs b/imgui/src/io.rs
index 2362c31..50f8975 100644
--- a/imgui/src/io.rs
+++ b/imgui/src/io.rs
@@ -339,7 +339,11 @@ pub struct Io {
     nav_inputs_down_duration: [f32; NavInput::COUNT + NavInput::INTERNAL_COUNT],
     nav_inputs_down_duration_prev: [f32; NavInput::COUNT + NavInput::INTERNAL_COUNT],
     pen_pressure: f32,
-    app_focus_lost: bool,
+
+    /// Clear buttons state when focus is lost (this is useful so
+    /// e.g. releasing Alt after focus loss on Alt-Tab doesn't trigger
+    /// the Alt menu toggle)
+    pub app_focus_lost: bool,
     input_queue_surrogate: sys::ImWchar16,
     input_queue_characters: ImVector<sys::ImWchar>,
 }