diff --git a/development/autotests/invertedTests b/development/autotests/invertedTests
index c1011e8bee..cff37e08bf 100644
--- a/development/autotests/invertedTests
+++ b/development/autotests/invertedTests
@@ -513,6 +513,8 @@ export/export/latex/lyxbugs-resolved/cprotect/7779-float-in-par-env_docbook5
 #   See also ML discussion:
 #     https://www.mail-archive.com/search?l=mid&q=20211102011304.dmrcr7gjpxxwpd4o%40poole
 export/examples/(|ja/)Modules/LilyPond_Book_docbook5
+# - Undiagnosed issue.
+export/doc/ca/Intro_docbook5
 
 Sublabel: docbook poster
 # Posters cannot be properly exported, the LyX documents are too far from