diff --git a/phpBB/includes/functions_posting.php b/phpBB/includes/functions_posting.php
index e1cfb3145e..30e7cbf451 100644
--- a/phpBB/includes/functions_posting.php
+++ b/phpBB/includes/functions_posting.php
@@ -821,7 +821,7 @@ function posting_gen_attachment_entry($attachment_data, &$filename_data, $show_a
 	global $cache, $request;
 
 	// $forum_id when FALSE check for PMs if INT then check for forum id (topics|posts)
-	$forum_id = $request->variable('f', 0) ? $request->variable('f', 0) : false;
+	$forum_id = $request->variable('f', 0) ?: false;
 	$allowed_attachments = array_keys($cache->obtain_attach_extensions($forum_id)['_allowed_']);
 
 	// Some default template variables