diff --git a/layouts/partials/highlightgroup.html b/layouts/partials/highlightgroup.html
index 86ce47b..ff4f92b 100644
--- a/layouts/partials/highlightgroup.html
+++ b/layouts/partials/highlightgroup.html
@@ -2,7 +2,7 @@
 {{- if (or .firstLine .lastLine) -}}
 {{- page.Scratch.Add "highlightGroupAttrs" (printf " data-first-line=\"%v\" data-last-line=\"%v\"" .firstLine .lastLine) -}}
 {{- end -}}
-{{- if eq .language "Agda" -}}
+{{- if eq (lower .language) "agda" -}}
 {{- page.Scratch.Add "highlightGroupAttrs" " data-agda-block" -}}
 {{- end -}}
 {{ partial "group.html" (dict "url" .url "path" .path "comment" .comment "content" (highlight .code .language .opts) "attrs" (page.Scratch.Get "highlightGroupAttrs")) }}