diff --git a/lib/manager/npm/extract/index.js b/lib/manager/npm/extract/index.js
index eb015be31251f81f6960090200e2c10bd5dc715e..75d008777864ca494f7cc9f85317728cd26137d9 100644
--- a/lib/manager/npm/extract/index.js
+++ b/lib/manager/npm/extract/index.js
@@ -23,6 +23,7 @@ async function extractDependencies(content, packageFile, config) {
     logger.info({ packageFile }, 'Invalid JSON');
     return null;
   }
+  // eslint-disable-next-line no-underscore-dangle
   if (packageJson._id && packageJson._args && packageJson._from) {
     logger.info('Ignoring vendorised package.json');
     return null;