diff --git a/phpBB/phpbb/storage/storage.php b/phpBB/phpbb/storage/storage.php
index 98cecb5936..1f22090745 100644
--- a/phpBB/phpbb/storage/storage.php
+++ b/phpBB/phpbb/storage/storage.php
@@ -146,7 +146,7 @@ class storage
 	 */
 	public function exists($path, $full_check = false)
 	{
-		return ($this->is_tracked($path) && !$full_check || $this->get_adapter()->exists($path));
+		return ($this->is_tracked($path) && (!$full_check || $this->get_adapter()->exists($path)));
 	}
 
 	/**