diff --git a/.gitignore b/.gitignore
index 9827ed69..212413f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 packages/*
+lib/classes/htmlpurifier/library/HTMLPurifier/DefinitionCache/Serializer/*/
 temp/*
 templates/*
 install/update.log