diff --git a/src/Avalonia.Controls/Primitives/Thumb.cs b/src/Avalonia.Controls/Primitives/Thumb.cs
index da4dc63d1e..b0f9ab1f85 100644
--- a/src/Avalonia.Controls/Primitives/Thumb.cs
+++ b/src/Avalonia.Controls/Primitives/Thumb.cs
@@ -75,6 +75,7 @@ namespace Avalonia.Controls.Primitives
         protected override void OnPointerPressed(PointerPressedEventArgs e)
         {
             e.Device.Capture(this);
+            e.Handled = true;
             _lastPoint = e.GetPosition(this);
 
             var ev = new VectorEventArgs
@@ -91,6 +92,7 @@ namespace Avalonia.Controls.Primitives
             if (_lastPoint.HasValue)
             {
                 e.Device.Capture(null);
+                e.Handled = true;
                 _lastPoint = null;
 
                 var ev = new VectorEventArgs