diff --git a/metadapta.go b/metadapta.go
index 03bef8e..55f1c0c 100644
--- a/metadapta.go
+++ b/metadapta.go
@@ -194,7 +194,7 @@ func (this *transA) Send(method uint16, data []byte) error {
 	return this.parent.sendMessageSafe(this.id, method, data)
 }
 
-func (this *transA) SendWriter(method uint16) (io.Writer, error) {
+func (this *transA) SendWriter(method uint16) (io.WriteCloser, error) {
 	// close previous writer if necessary
 	if this.currentWriter != nil {
 		this.currentWriter.Close()