diff --git a/stream.go b/stream.go
index ed06d69..3be1291 100644
--- a/stream.go
+++ b/stream.go
@@ -291,6 +291,7 @@ func (s *Stream) WriteSCTP(p []byte, ppi PayloadProtocolIdentifier) (int, error)
 			s.sequenceNumber--
 		}
 		s.lock.Unlock()
+		n = 0
 	}
 	if s.association.isBlockWrite() {
 		s.writeLock.Unlock()