diff --git a/src/Avalonia.Controls/Primitives/Popup.cs b/src/Avalonia.Controls/Primitives/Popup.cs
index 1ed3896dd3..a5cdeefb0e 100644
--- a/src/Avalonia.Controls/Primitives/Popup.cs
+++ b/src/Avalonia.Controls/Primitives/Popup.cs
@@ -53,6 +53,7 @@ namespace Avalonia.Controls.Primitives
             AvaloniaProperty.Register<Popup, PopupPositionerConstraintAdjustment>(
                 nameof(PlacementConstraintAdjustment),
                 PopupPositionerConstraintAdjustment.FlipX | PopupPositionerConstraintAdjustment.FlipY |
+                PopupPositionerConstraintAdjustment.SlideX | PopupPositionerConstraintAdjustment.SlideY |
                 PopupPositionerConstraintAdjustment.ResizeX | PopupPositionerConstraintAdjustment.ResizeY);
 
         /// <summary>