diff --git a/src/Avalonia.Themes.Fluent/TabItem.xaml b/src/Avalonia.Themes.Fluent/TabItem.xaml
index ca8d4dfeb5..1c9574f169 100644
--- a/src/Avalonia.Themes.Fluent/TabItem.xaml
+++ b/src/Avalonia.Themes.Fluent/TabItem.xaml
@@ -52,7 +52,7 @@
   </Style>
   <Style Selector="TabItem /template/ Border#PART_SelectedPipe">
     <Setter Property="IsVisible" Value="False" />
-	<Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
   </Style>
 
   <!-- Selected state -->