diff --git a/lib/url.js b/lib/url.js
index c7ac8ff5739b9a..2b32a7e8bc8843 100644
--- a/lib/url.js
+++ b/lib/url.js
@@ -427,10 +427,7 @@ Url.prototype.parse = function parse(url, parseQueryString, slashesDenoteHost) {
         // It only converts parts of the domain name that
         // have non-ASCII characters, i.e. it doesn't matter if
         // you call it with a domain that already is ASCII-only.
-
-        // Use lenient mode (`true`) to try to support even non-compliant
-        // URLs.
-        this.hostname = toASCII(this.hostname, true);
+        this.hostname = toASCII(this.hostname);
 
         // Prevent two potential routes of hostname spoofing.
         // 1. If this.hostname is empty, it must have become empty due to toASCII