diff --git a/src/js/restore.js b/src/js/restore.js
index acadb4dd8..5f15e27a3 100644
--- a/src/js/restore.js
+++ b/src/js/restore.js
@@ -194,8 +194,8 @@ app.controller('RestoreController', ['$scope', 'Client', function ($scope, Clien
             return;
         }
 
-        if ($scope.backupId.indexOf('box') !== 0) {
-            $scope.error.generic = 'Backup id must start with "box"';
+        if ($scope.backupId.indexOf('box') === -1) {
+            $scope.error.generic = 'Backup id must contain "box"';
             $scope.error.backupId = true;
             $scope.busy = false;
             return;