diff --git a/core/commands/config.go b/core/commands/config.go
index fd6aa194a..f51576806 100644
--- a/core/commands/config.go
+++ b/core/commands/config.go
@@ -311,7 +311,7 @@ func editConfig(filename string) error {
 func replaceConfig(r repo.Repo, file io.Reader) error {
 	var cfg config.Config
 	if err := json.NewDecoder(file).Decode(&cfg); err != nil {
-		return errors.New("failed to decode file as config: " + err.Error())
+		return errors.New("failed to decode file as config")
 	}
 	if len(cfg.Identity.PrivKey) != 0 {
 		return errors.New("setting private key with API is not supported")