diff --git a/unread/unread.go b/unread/unread.go
index 99cea0c..d2764d7 100644
--- a/unread/unread.go
+++ b/unread/unread.go
@@ -107,8 +107,7 @@ func (mc *mailCounter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (mc *mailCounter) updateCount(path string) error {
-	dn := filepath.Dir(path)
-	if !isMailDir(dn) {
+	if !isMailDir(path) {
 		return nil
 	}