diff --git a/lib/workers/branch/lock-files.js b/lib/workers/branch/lock-files.js
index 4347dbd8a6642405bf75acbba17aefe7673b0750..a11db9a8b43fb371bcfcf42a73054670bc22e1b2 100644
--- a/lib/workers/branch/lock-files.js
+++ b/lib/workers/branch/lock-files.js
@@ -108,7 +108,7 @@ function determineLockFileDirs(config) {
   }
 
   if (
-    config.updatedPackageFile &&
+    config.updatedPackageFiles &&
     config.updatedPackageFiles.length &&
     config.lernaLockFile
   ) {