diff --git a/transport/control.go b/transport/control.go
index f6b38a5a6..484b087f0 100644
--- a/transport/control.go
+++ b/transport/control.go
@@ -56,43 +56,33 @@ type windowUpdate struct {
 	increment uint32
 }
 
-func (windowUpdate) isItem() bool {
-	return true
-}
+func (*windowUpdate) item() {}
 
 type settings struct {
 	ack bool
 	ss  []http2.Setting
 }
 
-func (settings) isItem() bool {
-	return true
-}
+func (*settings) item() {}
 
 type resetStream struct {
 	streamID uint32
 	code     http2.ErrCode
 }
 
-func (resetStream) isItem() bool {
-	return true
-}
+func (*resetStream) item() {}
 
 type flushIO struct {
 }
 
-func (flushIO) isItem() bool {
-	return true
-}
+func (*flushIO) item() {}
 
 type ping struct {
 	ack  bool
 	data [8]byte
 }
 
-func (ping) isItem() bool {
-	return true
-}
+func (*ping) item() {}
 
 // quotaPool is a pool which accumulates the quota and sends it to acquire()
 // when it is available.
diff --git a/transport/transport.go b/transport/transport.go
index bfb628adc..87fdf532c 100644
--- a/transport/transport.go
+++ b/transport/transport.go
@@ -63,13 +63,11 @@ type recvMsg struct {
 	err error
 }
 
-func (recvMsg) isItem() bool {
-	return true
-}
+func (*recvMsg) item() {}
 
 // All items in an out of a recvBuffer should be the same type.
 type item interface {
-	isItem() bool
+	item()
 }
 
 // recvBuffer is an unbounded channel of item.