diff --git a/device/send.go b/device/send.go
index 7eca099..a00e2bb 100644
--- a/device/send.go
+++ b/device/send.go
@@ -568,6 +568,7 @@ func (peer *Peer) RoutineSequentialSender(maxBatchSize int) {
 				device.PutMessageBuffer(elem.buffer)
 				device.PutOutboundElement(elem)
 			}
+			device.PutOutboundElementsContainer(elemsContainer)
 			continue
 		}
 		dataSent := false