diff --git a/trytond/doc/linkcheck_ignore.json b/trytond/doc/linkcheck_ignore.json
index ae86156d83..a491e93793 100644
--- a/trytond/doc/linkcheck_ignore.json
+++ b/trytond/doc/linkcheck_ignore.json
@@ -1 +1,4 @@
-["https://datatracker.ietf.org/*"]
+[
+    "https://datatracker.ietf.org/*",
+    "https://www.gnu.org/*"
+]