@@ -64,6 +64,12 @@ b.len = 0
 	b.pos = 0
 }
 
+func (b *Buffer) SeekStart() error {
+	_, err := b.Seek(0, io.SeekStart)
+
+	return err
+}
+
 // Seek moves the read position by offset bytes relative to whence (Start, Current, End)
 func (b *Buffer) Seek(offset int64, whence int) (int64, error) {
 	var newpos int

@@ -230,6 +230,10 @@ // it would be nice to set LastMod here, but using the latest post
 	// date would be wrong as the homepage has its own content file
 	// without a date, which could be newer
 	sitemap.AddPath("/", time.Time{})
+	err = buf.SeekStart()
+	if err != nil {
+		return nil, err
+	}
 	h, _ = getHTMLStyleHash(buf)
 	r.Hashes = append(r.Hashes, h)