diff --git a/phpBB/includes/acp/auth.php b/phpBB/includes/acp/auth.php
index 7ff3212b72..930f2811cf 100644
--- a/phpBB/includes/acp/auth.php
+++ b/phpBB/includes/acp/auth.php
@@ -183,7 +183,7 @@ class auth_admin extends \phpbb\auth\auth
 		}
 
 		// Defining the user-function here to save some memory
-		$return_acl_fill = create_function('$value', 'return ' . $acl_fill . ';');
+		$return_acl_fill = function () use ($acl_fill) { return $acl_fill; };
 
 		// Actually fill the gaps
 		if (sizeof($hold_ary))