diff --git a/.eslintrc b/.eslintrc
index 129b993..b663b6e 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -3,8 +3,5 @@
   "env": {
     "node": true,
     "es6": true
-  },
-  "rules": {
-    "strict": "error"
   }
 }
diff --git a/.mocharc.json b/.mocharc.json
index dd7e93b..3855a9f 100644
--- a/.mocharc.json
+++ b/.mocharc.json
@@ -2,6 +2,5 @@
   "check-leaks": true,
   "throw-deprecation": true,
   "trace-deprecation": true,
-  "trace-warnings": true,
-  "use_strict": true
+  "trace-warnings": true
 }
diff --git a/index.js b/index.js
index cde5bf7..6dd5032 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,3 @@
-'use strict';
-
 const parser = require('@babel/parser');
 
 /**
@@ -79,10 +77,7 @@ module.exports.prototype.traverse = function(node, cb) {
       // Avoid visited nodes
       if (key === 'parent' || !node[key]) { continue; }
 
-      if (typeof node[key] === 'object') {
-        node[key].parent = node;
-      }
-
+      node[key].parent = node;
       this.traverse(node[key], cb);
     }
   }
diff --git a/test/test.js b/test/test.js
index 19ac983..c217a8b 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,7 +1,5 @@
 /* eslint-env mocha */
 
-'use strict';
-
 const assert = require('assert');
 const Walker = require('../');
 const fs = require('fs');