diff --git a/src/Avalonia.Controls/StackPanel.cs b/src/Avalonia.Controls/StackPanel.cs
index e7e0eb3f3d..d0841ea55d 100644
--- a/src/Avalonia.Controls/StackPanel.cs
+++ b/src/Avalonia.Controls/StackPanel.cs
@@ -5,6 +5,7 @@
 
 using System;
 using Avalonia.Input;
+using Avalonia.Layout;
 
 namespace Avalonia.Controls
 {