diff --git a/src/lib/isEmail.js b/src/lib/isEmail.js
index 1aceca3cf..308f522d4 100644
--- a/src/lib/isEmail.js
+++ b/src/lib/isEmail.js
@@ -10,6 +10,7 @@ const default_email_options = {
   allow_underscores: false,
   require_display_name: false,
   allow_utf8_local_part: true,
+  allow_idn: true,
   require_tld: true,
   blacklisted_chars: '',
   ignore_max_length: false,
@@ -144,6 +145,7 @@ export default function isEmail(str, options) {
     require_tld: options.require_tld,
     ignore_max_length: options.ignore_max_length,
     allow_underscores: options.allow_underscores,
+    allow_idn: options.allow_idn,
   })) {
     if (!options.allow_ip_domain) {
       return false;
diff --git a/src/lib/isFQDN.js b/src/lib/isFQDN.js
index eb6928fda..394b76387 100644
--- a/src/lib/isFQDN.js
+++ b/src/lib/isFQDN.js
@@ -7,6 +7,7 @@ const default_fqdn_options = {
   allow_trailing_dot: false,
   allow_numeric_tld: false,
   allow_wildcard: false,
+  allow_idn: true,
   ignore_max_length: false,
 };
 
@@ -71,6 +72,11 @@ export default function isFQDN(str, options) {
       return false;
     }
 
+    // verify if domain is IDN
+    if (!options.allow_idn && !/^[a-z0-9-_]+$/i.test(part)) {
+      return false;
+    }
+
     return true;
   });
 }