diff --git a/src/Avalonia.Controls/Primitives/TextSelectorLayer.cs b/src/Avalonia.Controls/Primitives/TextSelectorLayer.cs
index 07eef005c3..fad7718917 100644
--- a/src/Avalonia.Controls/Primitives/TextSelectorLayer.cs
+++ b/src/Avalonia.Controls/Primitives/TextSelectorLayer.cs
@@ -27,7 +27,7 @@ namespace Avalonia.Controls.Primitives
         {
             foreach (Control child in Children)
                 child.Measure(availableSize);
-            return availableSize;
+            return default;
         }
 
         protected override Size ArrangeOverride(Size finalSize)