diff --git a/lib/workers/repository/cleanup.js b/lib/workers/repository/cleanup.js
index 6df97c52618e60d919e9821e2bdc189719ff1d55..12dcda87cae2130f944fe5ad27547c1112c660b5 100644
--- a/lib/workers/repository/cleanup.js
+++ b/lib/workers/repository/cleanup.js
@@ -20,7 +20,7 @@ async function pruneStaleBranches(config) {
   let renovateBranches = await platform.getAllRenovateBranches(
     config.branchPrefix
   );
-  logger.debug(`renovateBranches=${renovateBranches}`);
+  logger.debug({ branchList, renovateBranches });
   const lockFileBranch = `${config.branchPrefix}lock-file-maintenance`;
   if (renovateBranches.includes(lockFileBranch)) {
     logger.debug('Checking lock file branch');