diff --git a/bar.go b/bar.go
index 6d66443..b71e6b4 100644
--- a/bar.go
+++ b/bar.go
@@ -156,6 +156,7 @@
 	sync := make(chan struct{})
 	select {
 	case b.operateState <- func(s *bState) {
+		defer close(sync)
 		for _, decorators := range [][]decor.Decorator{
 			s.pDecorators,
 			s.aDecorators,
@@ -164,7 +165,6 @@
 				cb(extractBaseDecorator(d))
 			}
 		}
-		close(sync)
 	}:
 		<-sync
 	case <-b.done:
diff --git a/progress.go b/progress.go
index c409ad3..c9b5cc8 100644
--- a/progress.go
+++ b/progress.go
@@ -159,13 +159,13 @@
 	sync := make(chan struct{})
 	select {
 	case p.operateState <- func(s *pState) {
+		defer close(sync)
 		for i := 0; i < s.bHeap.Len(); i++ {
 			bar := s.bHeap[i]
 			if !cb(bar) {
 				break
 			}
 		}
-		close(sync)
 	}:
 		<-sync
 	case <-p.done: