diff --git a/lib/parser.js b/lib/parser.js
index ad5924a..5eac40d 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -115,10 +115,9 @@ module.exports = class Parser {
       cb = undefined
     }
 
-    if (!options) {
-      options = {
-        parseIncludes: true
-      }
+    options = {
+      parseIncludes: true,
+      ...(options || {})
     }
 
     if (cb) {