diff --git a/lib/index.js b/lib/index.js
index 089187711e3915fedc3689368a967778af363b4d..612d478fbbac1175b55f25880c75fd3ef86e3478 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -150,7 +150,10 @@ async function findPackageFiles(config) {
 
 async function getAllRepoUpgrades(repo) {
   let upgrades = [];
-  for (const packageFile of repo.packageFiles) {
+  for (let packageFile of repo.packageFiles) {
+    if (typeof packageFile === 'string') {
+      packageFile = { fileName: packageFile };
+    }
     const cascadedConfig = configParser.getCascadedConfig(repo, packageFile);
     upgrades = upgrades.concat(
       await worker.processPackageFile(