diff --git a/container_option.go b/container_option.go
index f238b1d..f6013e7 100644
--- a/container_option.go
+++ b/container_option.go
@@ -39,7 +39,7 @@
 
 // WithManualRefresh disables internal auto refresh time.Ticker.
 // Refresh will occur upon receive value from provided ch.
-func WithManualRefresh(ch <-chan interface{}) ContainerOption {
+func WithManualRefresh(ch chan interface{}) ContainerOption {
 	return func(s *pState) {
 		s.externalRefresh = ch
 		s.disableAutoRefresh = true
diff --git a/progress.go b/progress.go
index f2cb7c6..4dc6129 100644
--- a/progress.go
+++ b/progress.go
@@ -54,7 +54,7 @@
 	disableAutoRefresh bool
 	rr                 time.Duration
 	uwg                *sync.WaitGroup
-	externalRefresh    <-chan interface{}
+	externalRefresh    chan interface{}
 	renderDelay        <-chan struct{}
 	shutdownNotifier   chan struct{}
 	queueBars          map[*Bar]*Bar