diff --git a/phpBB/includes/acp/acp_bbcodes.php b/phpBB/includes/acp/acp_bbcodes.php
index 130a3ef542..e245eea069 100644
--- a/phpBB/includes/acp/acp_bbcodes.php
+++ b/phpBB/includes/acp/acp_bbcodes.php
@@ -409,7 +409,9 @@ class acp_bbcodes
 	{
 		$bbcode_match = trim($bbcode_match);
 		$bbcode_tpl = trim($bbcode_tpl);
-		$utf8 = strpos($bbcode_match, 'INTTEXT') !== false;
+
+		// Allow unicode characters for URL|LOCAL_URL|RELATIVE_URL|INTTEXT tokens
+		$utf8 = preg_match('/(URL|LOCAL_URL|RELATIVE_URL|INTTEXT)/', $bbcode_match);
 
 		$utf8_pcre_properties = phpbb_pcre_utf8_support();
 
diff --git a/phpBB/phpbb/db/migration/data/v31x/update_custom_bbcodes_with_idn.php b/phpBB/phpbb/db/migration/data/v31x/update_custom_bbcodes_with_idn.php
new file mode 100644
index 0000000000..854ed1f568
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v31x/update_custom_bbcodes_with_idn.php
@@ -0,0 +1,70 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\migration\data\v31x;
+
+class update_custom_bbcodes_with_idn extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array(
+			'\phpbb\db\migration\data\v31x\v312',
+		);
+	}
+
+	public function update_data()
+	{
+		return array(
+			array('custom', array(array($this, 'update_bbcodes_table'))),
+		);
+	}
+
+	public function update_bbcodes_table()
+	{
+		if (!class_exists('acp_bbcodes'))
+		{
+			include($this->phpbb_root_path . 'includes/acp/acp_bbcodes.' . $this->php_ext);
+		}
+
+		$bbcodes = new \acp_bbcodes();
+
+		$sql = 'SELECT bbcode_id, bbcode_match, bbcode_tpl
+			FROM ' . BBCODES_TABLE;
+		$result = $this->sql_query($sql);
+
+		$sql_ary = array();
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			$data = array();
+			if (preg_match('/(URL|LOCAL_URL|RELATIVE_URL)/', $row['bbcode_match']))
+			{
+				$data = $bbcodes->build_regexp($row['bbcode_match'], $row['bbcode_tpl']);
+				$sql_ary[$row['bbcode_id']] = array(
+					'first_pass_match'			=> $data['first_pass_match'],
+					'first_pass_replace'		=> $data['first_pass_replace'],
+					'second_pass_match'			=> $data['second_pass_match'],
+					'second_pass_replace'		=> $data['second_pass_replace']
+				);
+			}
+		}
+		$this->db->sql_freeresult($result);
+
+		foreach ($sql_ary as $bbcode_id => $bbcode_data)
+		{
+			$sql = 'UPDATE ' . BBCODES_TABLE . '
+				SET ' . $this->db->sql_build_array('UPDATE', $bbcode_data) . '
+				WHERE bbcode_id = ' . (int) $bbcode_id;
+			$this->sql_query($sql);
+		}
+	}
+}