diff --git a/TDL.go b/TDL.go
index d6861bf..f469b34 100644
--- a/TDL.go
+++ b/TDL.go
@@ -30,7 +30,7 @@ func outfile(infile string) io.Writer {
 	basename := path.Base(infile)
 	extension := path.Ext(basename)
 	basename = strings.TrimSuffix(basename, extension)
-	name := basename + time.Now().Format(STAMP_FORMAT) + ".txt"
+	name := basename + "-" + time.Now().Format(STAMP_FORMAT) + ".txt"
 	f, err := os.OpenFile(name, os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)