diff --git a/protocol7/packet.go b/protocol7/packet.go
index 165bac7..f8459c7 100644
--- a/protocol7/packet.go
+++ b/protocol7/packet.go
@@ -305,6 +305,7 @@ func (packet *Packet) Pack(connection *Session) []byte {
 			Resend:      false,
 			Control:     true,
 		}
+		packet.Header.NumChunks = 0
 	}
 
 	if packet.Header.Flags.Compression {