diff --git a/src/routes/provision.js b/src/routes/provision.js
index 9a17910d6..29ec0d483 100644
--- a/src/routes/provision.js
+++ b/src/routes/provision.js
@@ -102,7 +102,7 @@ function restore(req, res, next) {
     if (typeof backupConfig.format !== 'string') return next(new HttpError(400, 'format must be a string'));
     if ('acceptSelfSignedCerts' in backupConfig && typeof backupConfig.acceptSelfSignedCerts !== 'boolean') return next(new HttpError(400, 'format must be a boolean'));
 
-    if (typeof req.body.backupId !== 'string') return next(new HttpError(400, 'backupId must be a string or null'));
+    if (typeof req.body.backupId !== 'string') return next(new HttpError(400, 'backupId must be a string'));
     if (typeof req.body.version !== 'string') return next(new HttpError(400, 'version must be a string'));
 
     if ('sysinfoConfig' in req.body && typeof req.body.sysinfoConfig !== 'object') return next(new HttpError(400, 'sysinfoConfig must be an object'));