diff --git a/debian/maintscript b/debian/maintscript
index 628eafbeb7..0a0c86d4e6 100644
--- a/debian/maintscript
+++ b/debian/maintscript
@@ -2,4 +2,5 @@ rm_conffile /etc/gitlab/initializers/devise_async.rb 8.8.2+dfsg-5    gitlab
 rm_conffile /etc/gitlab/gitlab.teatro.yml            8.11.3+dfsg1-1  gitlab
 rm_conffile /etc/gitlab/initializers/haml.rb         8.11.3+dfsg1-1  gitlab
 rm_conffile /etc/gitlab/initializers/math_lexer.rb   9.5.4+dfsg-7    gitlab
+rm_conffile /etc/gitlab/initializers/plantuml_lexer.rb   9.5.4+dfsg-7    gitlab
 dir_to_symlink /usr/share/gitlab/app/assets/javascripts/locale	/var/lib/gitlab/locale         9.5.4+dfsg-5  gitlab