diff --git a/core/modules/link/src/Plugin/migrate/process/FieldLink.php b/core/modules/link/src/Plugin/migrate/process/FieldLink.php
index 79642f7..353a89c 100644
--- a/core/modules/link/src/Plugin/migrate/process/FieldLink.php
+++ b/core/modules/link/src/Plugin/migrate/process/FieldLink.php
@@ -69,8 +69,79 @@ protected function canonicalizeUri($uri) {
       $uri = substr($uri, strlen('<front>'));
     }
     else {
-      // A list of unicode-encoded characters that could be included in a uri.
-      $link_ichars = '¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿŒœŠšŸŽžƒ';
+      // List of unicode-encoded characters that were allowed in URLs,
+      // according to link module in Drupal 7.
+      // @see http://cgit.drupalcode.org/link/tree/link.module?h=7.x-1.5-beta2#n1382
+      $link_ichars = implode('', [
+        "¿", // &#x00BF;
+        "À", // &#x00C0;
+        "Á", // &#x00C1;
+        "Â", // &#x00C2;
+        "Ã", // &#x00C3;
+        "Ä", // &#x00C4;
+        "Å", // &#x00C5;
+        "Æ", // &#x00C6;
+        "Ç", // &#x00C7;
+        "È", // &#x00C8;
+        "É", // &#x00C9;
+        "Ê", // &#x00CA;
+        "Ë", // &#x00CB;
+        "Ì", // &#x00CC;
+        "Í", // &#x00CD;
+        "Î", // &#x00CE;
+        "Ï", // &#x00CF;
+        "Ð", // &#x00D0;
+        "Ñ", // &#x00D1;
+        "Ò", // &#x00D2;
+        "Ó", // &#x00D3;
+        "Ô", // &#x00D4;
+        "Õ", // &#x00D5;
+        "Ö", // &#x00D6;
+        // × &#x00D7;
+        "Ø", // &#x00D8;
+        "Ù", // &#x00D9;
+        "Ú", // &#x00DA;
+        "Û", // &#x00DB;
+        "Ü", // &#x00DC;
+        "Ý", // &#x00DD;
+        "Þ", // &#x00DE;
+        "ß", // &#x00DF;
+        "à", // &#x00E0;
+        "á", // &#x00E1;
+        "â", // &#x00E2;
+        "ã", // &#x00E3;
+        "ä", // &#x00E4;
+        "å", // &#x00E5;
+        "æ", // &#x00E6;
+        "ç", // &#x00E7;
+        "è", // &#x00E8;
+        "é", // &#x00E9;
+        "ê", // &#x00EA;
+        "ë", // &#x00EB;
+        "ì", // &#x00EC;
+        "í", // &#x00ED;
+        "î", // &#x00EE;
+        "ï", // &#x00EF;
+        "ð", // &#x00F0;
+        "ñ", // &#x00F1;
+        "ò", // &#x00F2;
+        "ó", // &#x00F3;
+        "ô", // &#x00F4;
+        "õ", // &#x00F5;
+        "ö", // &#x00F6;
+        // ÷ &#x00F7;
+        "ø", // &#x00F8;
+        "ù", // &#x00F9;
+        "ú", // &#x00FA;
+        "û", // &#x00FB;
+        "ü", // &#x00FC;
+        "ý", // &#x00FD;
+        "þ", // &#x00FE;
+        "ÿ", // &#x00FF;
+        "Œ", // &#x0152;
+        "œ", // &#x0153;
+        "Ÿ", // &#x0178;
+      ]);
 
       // Pattern specific to internal links.
       $internal_pattern = "/^(?:[a-z0-9" . $link_ichars . "_\-+\[\] ]+)";
@@ -85,9 +156,7 @@ protected function canonicalizeUri($uri) {
 
       if (!preg_match($internal_pattern . $end, $uri)) {
         $allowed_protocols = ['http', 'https', 'ftp', 'news', 'nntp', 'telnet', 'mailto', 'irc', 'ssh', 'sftp', 'webcal'];
-        // List of domains that were allowed in Drupal 6 & Drupal 7 (so we are
-        // not interested in others).
-        $link_domains = 'aero|arpa|asia|biz|com|cat|coop|edu|gov|info|int|jobs|mil|museum|name|nato|net|org|pro|travel|mobi|local';
+        $link_domains = '[a-z][a-z0-9-]{1,62}';
 
         // Starting a parenthesis group with (?: means that it is grouped, but is not captured
         $protocol = '((?:' . implode("|", $allowed_protocols) . '):\/\/)';