diff --git a/connection.go b/connection.go
index 005d734..56154a7 100644
--- a/connection.go
+++ b/connection.go
@@ -46,5 +46,5 @@ type Trans interface {
 	Receive() (method uint16, data []byte, err error)
 	// ReceiveReader receives a message as an [io.Reader]. Any reader
 	// previously opened through this function will be discarded.
-	ReceiveReader() (method uint16, size int64, data io.Reader, err error)
+	ReceiveReader() (method uint16, data io.Reader, err error)
 }