diff --git a/.hgignore b/.hgignore
index e3ad4fe7b2..403b73df6d 100644
--- a/.hgignore
+++ b/.hgignore
@@ -66,3 +66,4 @@ glob:indra/newview/search_history.txt
 glob:indra/newview/filters.xml
 glob:indra/newview/avatar_icons_cache.txt
 glob:indra/newview/avatar_lad.log
+glob:*.diff