diff --git a/protocols/luci-proto-openconnect/htdocs/luci-static/resources/protocol/openconnect.js b/protocols/luci-proto-openconnect/htdocs/luci-static/resources/protocol/openconnect.js
index 01b4498e0e..192eae52fd 100644
--- a/protocols/luci-proto-openconnect/htdocs/luci-static/resources/protocol/openconnect.js
+++ b/protocols/luci-proto-openconnect/htdocs/luci-static/resources/protocol/openconnect.js
@@ -43,7 +43,7 @@ function validateCert(priv, section_id, value) {
 
 	const beg = priv ? /^-----BEGIN (RSA )?PRIVATE KEY-----$/ : /^-----BEGIN CERTIFICATE-----$/;
 	const end = priv ? /^-----END (RSA )?PRIVATE KEY-----$/ : /^-----END CERTIFICATE-----$/;
-	const lines = value.trim().split(/[\r?\n]/);
+	const lines = value.trim().split(/[\r\n]/);
 	const base64 = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/;
 	const errmsg = _('This does not look like a valid PEM file');