diff --git a/main.go b/main.go
index c6c7e08..86cf471 100644
--- a/main.go
+++ b/main.go
@@ -69,7 +69,7 @@ func main() {
 		newName := fmt.Sprintf("%s%s", epdata.Title, path.Ext(filenames[i]))
 		if len(params) > 1 {
 			if match, _ := regexp.MatchString(".*%\\d*d.*", params[1]); match {
-				newName = fmt.Sprintf(params[1], i+1, newName)
+				newName = fmt.Sprintf(params[1], epdata.Index, newName)
 			} else {
 				newName = fmt.Sprintf(params[1], newName)
 			}