diff --git a/lib/config/definitions.js b/lib/config/definitions.js
index b9e799e022c0d06535d468e41301f954969073b9..a5c353af8a0c4e79eae6f9d3286f7b30cdd45787 100644
--- a/lib/config/definitions.js
+++ b/lib/config/definitions.js
@@ -507,6 +507,7 @@ const options = [
       prTitle: template('prTitle', 'lock-file-maintenance'),
       prBody: template('prBody', 'lock-file-maintenance'),
       schedule: ['before 5am on monday'],
+      groupName: null,
     },
     cli: false,
     mergeable: true,
diff --git a/test/config/__snapshots__/index.spec.js.snap b/test/config/__snapshots__/index.spec.js.snap
index afa551571639c62a944d823da50bc13990d55175..3fade9624ae1153fd84783f452bcae4951afb60b 100644
--- a/test/config/__snapshots__/index.spec.js.snap
+++ b/test/config/__snapshots__/index.spec.js.snap
@@ -5,6 +5,7 @@ Object {
   "branchName": "{{branchPrefix}}lock-file-maintenance",
   "commitMessage": "Update lock file",
   "enabled": true,
+  "groupName": null,
   "prBody": "This {{#if isGitHub}}Pull{{else}}Merge{{/if}} Request updates \`package.json\` lock files to use the latest dependency versions.
 
 {{#if schedule}}