diff --git a/apps/transport/lib/transport_web/templates/dataset/_resource_validation_summary_netex.html.heex b/apps/transport/lib/transport_web/templates/dataset/_resource_validation_summary_netex.html.heex
index 3dedcad347..ca878adf36 100644
--- a/apps/transport/lib/transport_web/templates/dataset/_resource_validation_summary_netex.html.heex
+++ b/apps/transport/lib/transport_web/templates/dataset/_resource_validation_summary_netex.html.heex
@@ -3,7 +3,7 @@
     <% link = resource_path(@conn, :details, @resource.id) <> "#validation-report" %>
     <% {severity, count} = NeTEx.count_max_severity(@validation.result) %>
     <a href={link}>
-      <span class={summary_class(%{severity: severity, count_errors: count})}>
+      <span class={summary_class(%{severity: String.capitalize(severity), count_errors: count})}>
         <%= if NeTEx.no_error?(severity) do %>
           <%= dgettext("page-dataset-details", "No error detected") %>
         <% else %>