diff --git a/phpBB/includes/acp/acp_bbcodes.php b/phpBB/includes/acp/acp_bbcodes.php
index ecbaff6274..a9574628e1 100644
--- a/phpBB/includes/acp/acp_bbcodes.php
+++ b/phpBB/includes/acp/acp_bbcodes.php
@@ -317,7 +317,7 @@ class acp_bbcodes
 		$bbcode_tpl = trim($bbcode_tpl);
 		$utf8 = strpos($bbcode_match, 'INTTEXT') !== false;
 
-		$utf8_pcre_properties = pcre_utf8_support();
+		$utf8_pcre_properties = phpbb_pcre_utf8_support();
 
 		$fp_match = preg_quote($bbcode_match, '!');
 		$fp_replace = preg_replace('#^\[(.*?)\]#', '[$1:$uid]', $bbcode_match);
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index b0c89bdceb..a118af0396 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -3285,7 +3285,7 @@ function get_censor_preg_expression($word, $use_unicode = true)
 	// Unescape the asterisk to simplify further conversions
 	$word = str_replace('\*', '*', preg_quote($word, '#'));
 
-	if ($use_unicode && pcre_utf8_support())
+	if ($use_unicode && phpbb_pcre_utf8_support())
 	{
 		// Replace asterisk(s) inside the pattern, at the start and at the end of it with regexes
 		$word = preg_replace(array('#(?<=[\p{Nd}\p{L}_])\*+(?=[\p{Nd}\p{L}_])#iu', '#^\*+#', '#\*+$#'), array('([\x20]*?|[\p{Nd}\p{L}_-]*?)', '[\p{Nd}\p{L}_-]*?', '[\p{Nd}\p{L}_-]*?'), $word);
@@ -4742,7 +4742,7 @@ function phpbb_user_session_handler()
 *
 * @return bool	Returns true if PCRE (the regular expressions library) supports UTF-8 encoding
 */
-function pcre_utf8_support()
+function phpbb_pcre_utf8_support()
 {
 	static $utf8_pcre_properties = null;
 	if (is_null($utf8_pcre_properties))
diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index 124aac18be..930cd4625f 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -1477,7 +1477,7 @@ function validate_username($username, $allowed_username = false)
 	$mbstring = $pcre = false;
 
 	// generic UTF-8 character types supported?
-	if (pcre_utf8_support())
+	if (phpbb_pcre_utf8_support())
 	{
 		$pcre = true;
 	}
@@ -1614,7 +1614,7 @@ function validate_password($password)
 	$pcre = $mbstring = false;
 
 	// generic UTF-8 character types supported?
-	if (pcre_utf8_support())
+	if (phpbb_pcre_utf8_support())
 	{
 		$upp = '\p{Lu}';
 		$low = '\p{Ll}';
diff --git a/phpBB/includes/search/fulltext_mysql.php b/phpBB/includes/search/fulltext_mysql.php
index 9660fd6986..827205f20d 100644
--- a/phpBB/includes/search/fulltext_mysql.php
+++ b/phpBB/includes/search/fulltext_mysql.php
@@ -43,7 +43,7 @@ class fulltext_mysql extends search_backend
 		$this->word_length = array('min' => $config['fulltext_mysql_min_word_len'], 'max' => $config['fulltext_mysql_max_word_len']);
 
 		// PHP may not be linked with the bundled PCRE lib and instead with an older version
-		if (pcre_utf8_support())
+		if (phpbb_pcre_utf8_support())
 		{
 			$this->pcre_properties = true;
 		}