diff --git a/bar.go b/bar.go
index 0f8305a..2796f97 100644
--- a/bar.go
+++ b/bar.go
@@ -42,7 +42,7 @@
 	runningBar    *Bar
 	cacheState    *bState
 	operateState  chan func(*bState)
-	cmdValue      chan int
+	cmdValue      chan uint
 	frameReaderCh chan io.Reader
 
 	// done is closed by Bar's goroutine, after cacheState is written
@@ -117,7 +117,7 @@
 		priority:      s.priority,
 		runningBar:    s.runningBar,
 		operateState:  make(chan func(*bState)),
-		cmdValue:      make(chan int),
+		cmdValue:      make(chan uint),
 		frameReaderCh: make(chan io.Reader, 1),
 		done:          make(chan struct{}),
 		shutdown:      make(chan struct{}),
@@ -160,7 +160,7 @@
 func (b *Bar) NumOfAppenders() int {
 	select {
 	case b.cmdValue <- cmdALen:
-		return <-b.cmdValue
+		return int(<-b.cmdValue)
 	case <-b.done:
 		return len(b.cacheState.aDecorators)
 	}
@@ -170,7 +170,7 @@
 func (b *Bar) NumOfPrependers() int {
 	select {
 	case b.cmdValue <- cmdPLen:
-		return <-b.cmdValue
+		return int(<-b.cmdValue)
 	case <-b.done:
 		return len(b.cacheState.pDecorators)
 	}
@@ -180,7 +180,7 @@
 func (b *Bar) ID() int {
 	select {
 	case b.cmdValue <- cmdId:
-		return <-b.cmdValue
+		return int(<-b.cmdValue)
 	case <-b.done:
 		return b.cacheState.id
 	}
@@ -273,17 +273,17 @@
 		case cmd := <-b.cmdValue:
 			switch {
 			case cmd&cmdId != 0:
-				b.cmdValue <- s.id
+				b.cmdValue <- uint(s.id)
 			case cmd&cmdTotal != 0:
-				b.cmdValue <- int(s.total)
+				b.cmdValue <- uint(s.total)
 			case cmd&cmdCurrent != 0:
-				b.cmdValue <- int(s.current)
+				b.cmdValue <- uint(s.current)
 			case cmd&cmdPLen != 0:
-				b.cmdValue <- len(s.pDecorators)
+				b.cmdValue <- uint(len(s.pDecorators))
 			case cmd&cmdALen != 0:
-				b.cmdValue <- len(s.aDecorators)
+				b.cmdValue <- uint(len(s.aDecorators))
 			case cmd&cmdCompleted != 0:
-				var v int
+				var v uint
 				if s.toComplete {
 					v = 1
 				}