diff --git a/src/Forms/Main.cs b/src/Forms/Main.cs
index ea26d8242..a3a21da17 100644
--- a/src/Forms/Main.cs
+++ b/src/Forms/Main.cs
@@ -7196,9 +7196,9 @@ namespace Nikse.SubtitleEdit.Forms
 
         public static void CopyStream(System.IO.Stream input, System.IO.Stream output)
         {
-            byte[] buffer = new byte[2000];
+            byte[] buffer = new byte[128000];
             int len;
-            while ((len = input.Read(buffer, 0, 2000)) > 0)
+            while ((len = input.Read(buffer, 0, 128000)) > 0)
             {
                 output.Write(buffer, 0, len);
             }