diff --git a/distribusi.go b/distribusi.go
index 964486d..25e1340 100644
--- a/distribusi.go
+++ b/distribusi.go
@@ -635,14 +635,14 @@ func mkDiv(c *cli.Context, mtype string, href, fname string, unknown bool) (stri
 
 	filename := fmt.Sprintf("<span class='filename'>%s</span>", fname)
 
-	ftype, _ := parseMtype(mtype)
+	ftype, stype := parseMtype(mtype)
 
 	if ftype == "text" {
 		divTag := "<div id=\"%s\" class='%s'>%s%s</div>"
 		div = fmt.Sprintf(divTag, fname, ftype, href, filename)
 	} else if ftype == "os" {
-		divTag := "<div id=\"%s\" class='%s'>%s</div>"
-		div = fmt.Sprintf(divTag, fname, ftype, href)
+		divTag := "<div id=\"%s\" class='x-%s'>%s</div>"
+		div = fmt.Sprintf(divTag, fname, stype, href)
 	} else {
 		if unknown {
 			// we really don't know what this is, so the filename is the href and we