diff --git a/sshserver/sshserver_windows.go b/sshserver/sshserver_windows.go
index 085d6e08..d2cb617a 100644
--- a/sshserver/sshserver_windows.go
+++ b/sshserver/sshserver_windows.go
@@ -11,6 +11,8 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+const SSHPreambleLength = 2
+
 type SSHServer struct{}
 
 type SSHPreamble struct {