diff --git a/internal/keyring/driver/json/json.go b/internal/keyring/driver/json/json.go
index b6f5dff..f0a2e27 100644
--- a/internal/keyring/driver/json/json.go
+++ b/internal/keyring/driver/json/json.go
@@ -47,7 +47,7 @@ func (p Provider) open(service string, write bool) (*os.File, error) {
 		return nil, errors.Wrap(err, "Failed to stat file")
 	}
 	if m := s.Mode(); m != 0600 {
-		return nil, fmt.Errorf("secrets.json file has unsafe permission %06o", m)
+		return nil, fmt.Errorf("secrets.json file has unsafe permission %04o", m)
 	}
 
 	return f, nil