diff --git a/lib/rules_core/normalize.js b/lib/rules_core/normalize.js
index 810657e04..ad196cdca 100644
--- a/lib/rules_core/normalize.js
+++ b/lib/rules_core/normalize.js
@@ -3,8 +3,9 @@
 'use strict';
 
 
-var NEWLINES_RE  = /\r[\n\u0085]?|[\u2424\u2028\u0085]/g;
-var NULL_RE      = /\u0000/g;
+// https://spec.commonmark.org/0.29/#line-ending
+var NEWLINES_RE  = /\r\n?|\n/g;
+var NULL_RE      = /\0/g;
 
 
 module.exports = function normalize(state) {