diff --git a/v2rayN/v2rayN/Tool/Utils.cs b/v2rayN/v2rayN/Tool/Utils.cs
index c92674bf..64fe2775 100644
--- a/v2rayN/v2rayN/Tool/Utils.cs
+++ b/v2rayN/v2rayN/Tool/Utils.cs
@@ -804,21 +804,14 @@ namespace v2rayN
 
         public static string UnGzip(byte[] buf)
         {
-            byte[] buffer = new byte[1024];
-            int n;
-            using (MemoryStream sb = new MemoryStream())
+            MemoryStream sb = new MemoryStream();
+            using (GZipStream input = new GZipStream(new MemoryStream(buf),
+            CompressionMode.Decompress,
+            false))
             {
-                using (GZipStream input = new GZipStream(new MemoryStream(buf),
-                    CompressionMode.Decompress,
-                    false))
-                {
-                    while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
-                    {
-                        sb.Write(buffer, 0, n);
-                    }
-                }
-                return Encoding.UTF8.GetString(sb.ToArray());
+                input.CopyTo(sb);
             }
+            return Encoding.UTF8.GetString(sb.ToArray());
         }
 
         #endregion