diff --git a/agent/sexpr.go b/agent/sexpr.go
index 14862b8..afc6156 100644
--- a/agent/sexpr.go
+++ b/agent/sexpr.go
@@ -47,7 +47,7 @@ func decodeRSAPublicKey(data string) (crypto.PublicKey, error) {
 	if err != nil {
 		return nil, err
 	}
-	if len(exp) != 2 {
+	if len(exp) < 2 {
 		return nil, ErrUnknownFormat
 	}