diff --git a/lib/config/index.js b/lib/config/index.js
index f5334749d..6aec63608 100644
--- a/lib/config/index.js
+++ b/lib/config/index.js
@@ -16,5 +16,9 @@ dotenv.config({
 dotenvExpand(process.env);
 
 const res = Object.assign({}, camelify(config), camelify(process.env));
-res.caCert = (() => {return res.caCert ? fs.readFileSync(path.resolve(process.cwd(), res.caCert)) : undefined;})(),
+
+if (res.caCert) {
+  res.caCert = fs.readFileSync(path.resolve(process.cwd(), res.caCert));
+}
+
 module.exports = res;