diff --git a/ssh/ssh.go b/ssh/ssh.go
index 2d543a2..b4a516b 100644
--- a/ssh/ssh.go
+++ b/ssh/ssh.go
@@ -120,7 +120,7 @@ func (r *Agent) Add(id *api.Identity, host string) (err error) {
 			path)
 		return
 	}
-	_, err = f.Write(cmd.Output)
+	_, err = f.Write(cmd.Output())
 	if err != nil {
 		err = liberr.Wrap(
 			err,