diff --git a/drive-demuxer.go b/drive-demuxer.go
index 38a3b5b..a059a5b 100644
--- a/drive-demuxer.go
+++ b/drive-demuxer.go
@@ -329,8 +329,8 @@ func (s *Step) Walk() {
 
 		switch rightState {
 		case FILE:
-			wg.Add(1)
 			if leftState == FILE {
+				wg.Add(1)
 				go func(child string) {
 					defer func() {
 						wg.Done()