diff --git a/src/Avalonia.Diagnostics/Views/TreePageView.xaml b/src/Avalonia.Diagnostics/Views/TreePageView.xaml
index 75fdc56f7e..244afda135 100644
--- a/src/Avalonia.Diagnostics/Views/TreePageView.xaml
+++ b/src/Avalonia.Diagnostics/Views/TreePageView.xaml
@@ -18,7 +18,7 @@
       </TreeView.Styles>
     </TreeView>
 
-    <GridSplitter Width="4" Orientation="Vertical" Grid.Column="1"/>
+    <GridSplitter Width="4" Grid.Column="1"/>
     <ContentControl Content="{Binding Details}" Grid.Column="2"/>
   </Grid>
 </UserControl>
\ No newline at end of file