diff --git a/phpBB/phpbb/db/driver/driver.php b/phpBB/phpbb/db/driver/driver.php
index 52e8545f36..8509c07d68 100644
--- a/phpBB/phpbb/db/driver/driver.php
+++ b/phpBB/phpbb/db/driver/driver.php
@@ -387,7 +387,7 @@ abstract class driver implements driver_interface
 	/**
 	* {@inheritDoc}
 	*/
-	function sql_fetchfield($field, $rownum = false, $query_id = false)
+	function sql_fetchfield($field, $rownum = false, &$query_id = false)
 	{
 		global $cache;
 
diff --git a/phpBB/phpbb/db/driver/driver_interface.php b/phpBB/phpbb/db/driver/driver_interface.php
index 918add2e62..ead8aa6d07 100644
--- a/phpBB/phpbb/db/driver/driver_interface.php
+++ b/phpBB/phpbb/db/driver/driver_interface.php
@@ -268,7 +268,7 @@ interface driver_interface
 	* @return	mixed		String value of the field in the selected row,
 	*						false, if the row does not exist
 	*/
-	public function sql_fetchfield($field, $rownum = false, $query_id = false);
+	public function sql_fetchfield($field, $rownum = false, &$query_id = false);
 
 	/**
 	* Fetch current row
diff --git a/phpBB/phpbb/db/driver/factory.php b/phpBB/phpbb/db/driver/factory.php
index 4d28ab1032..558f4ec60d 100644
--- a/phpBB/phpbb/db/driver/factory.php
+++ b/phpBB/phpbb/db/driver/factory.php
@@ -294,7 +294,7 @@ class factory implements driver_interface
 	/**
 	* {@inheritdoc}
 	*/
-	public function sql_fetchfield($field, $rownum = false, $query_id = false)
+	public function sql_fetchfield($field, $rownum = false, &$query_id = false)
 	{
 		return $this->get_driver()->sql_fetchfield($field, $rownum, $query_id);
 	}
diff --git a/phpBB/phpbb/db/driver/postgres.php b/phpBB/phpbb/db/driver/postgres.php
index 0289901ea9..17e3681f3a 100644
--- a/phpBB/phpbb/db/driver/postgres.php
+++ b/phpBB/phpbb/db/driver/postgres.php
@@ -298,7 +298,7 @@ class postgres extends \phpbb\db\driver\driver
 	/**
 	 * {@inheritDoc}
 	 */
-	function sql_fetchfield($field, $rownum = false, $query_id = false)
+	function sql_fetchfield($field, $rownum = false, &$query_id = false)
 	{
 		global $cache;