diff --git a/lib/storage/basic.js b/lib/storage/basic.js
index 667c6498b..d7bfe3ee6 100644
--- a/lib/storage/basic.js
+++ b/lib/storage/basic.js
@@ -91,5 +91,5 @@ Basic.restore = function (Env, archivePath, path, cb) {
 };
 
 Basic.isValidId = id => {
-    return id && typeof(id) === "string" && /^[a-zA-Z0-9-+=]+$/.test(id);
+    return id && typeof(id) === "string" && /^[a-zA-Z0-9-+_=]+$/.test(id);
 };