diff --git a/src/Avalonia.Themes.Default/Controls/SplitButton.xaml b/src/Avalonia.Themes.Default/Controls/SplitButton.xaml
index ce20a1a165..40880af1ec 100644
--- a/src/Avalonia.Themes.Default/Controls/SplitButton.xaml
+++ b/src/Avalonia.Themes.Default/Controls/SplitButton.xaml
@@ -61,6 +61,8 @@
     <Setter Property="BorderThickness" Value="{DynamicResource SplitButtonBorderThemeThickness}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
+    <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+    <Setter Property="VerticalContentAlignment" Value="Center" />
     <!--<Setter Property="UseSystemFocusVisuals" Value="True" />
     <Setter Property="FocusVisualMargin" Value="-3" />-->
     <Setter Property="KeyboardNavigation.IsTabStop" Value="True" />
diff --git a/src/Avalonia.Themes.Fluent/Controls/DropDownButton.xaml b/src/Avalonia.Themes.Fluent/Controls/DropDownButton.xaml
index 7299f5ccb5..97337c1cbf 100644
--- a/src/Avalonia.Themes.Fluent/Controls/DropDownButton.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/DropDownButton.xaml
@@ -23,6 +23,8 @@
     <Setter Property="Padding" Value="{DynamicResource ButtonPadding}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
+    <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+    <Setter Property="VerticalContentAlignment" Value="Center" />
     <!--<Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}" />
     <Setter Property="FocusVisualMargin" Value="-3" />-->
     <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
diff --git a/src/Avalonia.Themes.Fluent/Controls/SplitButton.xaml b/src/Avalonia.Themes.Fluent/Controls/SplitButton.xaml
index e0dd0180b3..ea7a81b802 100644
--- a/src/Avalonia.Themes.Fluent/Controls/SplitButton.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/SplitButton.xaml
@@ -37,6 +37,8 @@
     <Setter Property="BorderThickness" Value="{DynamicResource SplitButtonBorderThemeThickness}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
+    <Setter Property="HorizontalContentAlignment" Value="Stretch" />
+    <Setter Property="VerticalContentAlignment" Value="Center" />
     <!--<Setter Property="UseSystemFocusVisuals" Value="True" />
     <Setter Property="FocusVisualMargin" Value="-3" />-->
     <Setter Property="KeyboardNavigation.IsTabStop" Value="True" />