diff --git a/src/Calculator/Views/MainPage.xaml b/src/Calculator/Views/MainPage.xaml
index 07eef66..a2bad01 100644
--- a/src/Calculator/Views/MainPage.xaml
+++ b/src/Calculator/Views/MainPage.xaml
@@ -142,6 +142,7 @@
                     AutomationProperties.AutomationId="NormalAlwaysOnTopButton"
                     Click="AlwaysOnTopButtonClick"
                     Content=""
+                    TabIndex="3"
                     Visibility="{x:Bind Model.DisplayNormalAlwaysOnTopOption, Mode=OneWay}">
                 <Button.KeyboardAccelerators>
                     <KeyboardAccelerator Key="Up" Modifiers="Menu"/>