diff --git a/src/Browser/Avalonia.Browser/BrowserInputHandler.cs b/src/Browser/Avalonia.Browser/BrowserInputHandler.cs
index 40e7a3da57..ba97ad07a2 100644
--- a/src/Browser/Avalonia.Browser/BrowserInputHandler.cs
+++ b/src/Browser/Avalonia.Browser/BrowserInputHandler.cs
@@ -208,7 +208,8 @@ internal class BrowserInputHandler
             effectAllowed |= DragDropEffects.Move;
         }
 
-        if (effectAllowedStr.Equals("all", StringComparison.OrdinalIgnoreCase))
+        if (effectAllowedStr.Equals("all", StringComparison.OrdinalIgnoreCase)
+            || effectAllowedStr.Equals("uninitialized", StringComparison.OrdinalIgnoreCase))
         {
             effectAllowed |= DragDropEffects.Move | DragDropEffects.Copy | DragDropEffects.Link;
         }