diff --git a/layouts/partials/events/render-event.html b/layouts/partials/events/render-event.html
index 0f4d543d..f0c50c95 100644
--- a/layouts/partials/events/render-event.html
+++ b/layouts/partials/events/render-event.html
@@ -57,6 +57,7 @@
 
 {{ $anchor_base := anchorize $event_name }}
 {{ $additional_types := partial "json-schema/resolve-additional-types" (dict "schema" $event_data.properties.content "anchor_base" $anchor_base) }}
+{{ $additional_types = uniq $additional_types }}
 
 {{ range $additional_types }}
     {{ partial "openapi/render-object-table" . }}