diff --git a/src/Avalonia.X11/Selections/UriListHelper.cs b/src/Avalonia.X11/Selections/UriListHelper.cs
index 774a6ce87a..cb838a1661 100644
--- a/src/Avalonia.X11/Selections/UriListHelper.cs
+++ b/src/Avalonia.X11/Selections/UriListHelper.cs
@@ -47,6 +47,8 @@ internal static class UriListHelper
         foreach (var item in items)
             writer.WriteLine(item.Path.AbsoluteUri);
 
+        writer.Flush();
+
         return stream.ToArray();
     }
 }