diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index cc6840f..8aea142 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -20,7 +20,7 @@ <h1 class="header__title">{{ .Title }}</h1>
       {{- $subtitle = $subtitle | default $default_subtitle -}}
 
       {{- with $subtitle }}
-        <div class="header__subtitle metadata">{{ . | $.RenderString }}</div>
+        <div class="header__subtitle metadata">{{ . | markdownify }}</div>
       {{- end }}
     {{- end }}
   </div>