diff --git a/lib/workers/repository/process/lookup/rollback.js b/lib/workers/repository/process/lookup/rollback.js
index 7d14e3daf29996e51ad84c955bb4d10d358f842e..28b8fec0ab8d2a8a7d8a80ae38d7305c37ee9576 100644
--- a/lib/workers/repository/process/lookup/rollback.js
+++ b/lib/workers/repository/process/lookup/rollback.js
@@ -35,7 +35,7 @@ function getRollbackUpdate(config, versions) {
     { dependency: depName, versions },
     'Versions found before rolling back'
   );
-  lessThanVersions.sort(version.sortVersions);
+  lessThanVersions.sort((a, b) => version.sortVersions(a, b));
   const toVersion = lessThanVersions.pop();
   // istanbul ignore if
   if (!toVersion) {