diff --git a/progress.go b/progress.go
index a9643e9..3a603b6 100644
--- a/progress.go
+++ b/progress.go
@@ -37,10 +37,10 @@
 	hm           heapManager
 	dropS, dropD chan struct{}
 	refreshCh    chan time.Time
+	idCount      int
 
 	// following are provided/overrided by user
 	refreshRate      time.Duration
-	idCount          int
 	reqWidth         int
 	popPriority      int
 	popCompleted     bool