diff --git a/rules/utils/is-same-node.js b/rules/utils/is-same-node.js
index 8902f8405c..8ea393f215 100644
--- a/rules/utils/is-same-node.js
+++ b/rules/utils/is-same-node.js
@@ -1,3 +1,4 @@
+'use strict';
 
 module.exports = (node1, node2) =>
 	node1 &&