diff --git a/themes/mytheme/templates/partials/authorposts.html.twig b/themes/mytheme/templates/partials/authorposts.html.twig
index d323298fe9..7a69880736 100644
--- a/themes/mytheme/templates/partials/authorposts.html.twig
+++ b/themes/mytheme/templates/partials/authorposts.html.twig
@@ -1,4 +1,5 @@
 {% set blist = [] %}
+{% set catlist = taxonomy.taxonomy["category"]|keys %}
 {% if grav.theme.config.params.articles.blacklist is defined %}
     {% set blist = grav.theme.config.params.articles.blacklist %}
     {% set tmplst = [] %}