diff --git a/src/SharpCompress/IO/ReadOnlySubStream.cs b/src/SharpCompress/IO/ReadOnlySubStream.cs
index e95ec137..86ef1645 100644
--- a/src/SharpCompress/IO/ReadOnlySubStream.cs
+++ b/src/SharpCompress/IO/ReadOnlySubStream.cs
@@ -124,12 +124,9 @@ internal class ReadOnlySubStream : SharpCompressStream, IStreamStack
     )
     {
         var sliceLen = BytesLeftToRead < buffer.Length ? BytesLeftToRead : buffer.Length;
-        var mem = buffer;
-        if (sliceLen != buffer.Length)
-        {
-            mem = buffer.Slice(0, (int)sliceLen);
-        }
-        var read = await Stream.ReadAsync(mem, cancellationToken).ConfigureAwait(false);
+        var read = await Stream
+            .ReadAsync(buffer.Slice(0, (int)sliceLen), cancellationToken)
+            .ConfigureAwait(false);
         if (read > 0)
         {
             BytesLeftToRead -= read;