diff --git a/layouts/shortcodes/pswp-figure.html b/layouts/shortcodes/pswp-figure.html
index d9c8716..02c55a9 100644
--- a/layouts/shortcodes/pswp-figure.html
+++ b/layouts/shortcodes/pswp-figure.html
@@ -3,7 +3,7 @@
 <div class="box">
   <figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
     <div class="img"{{ if .Parent }} style="background-image: url('{{ $thumb.RelPermalink }}');"{{ end }}>
-      <img itemprop="thumbnail" src="{{ $thumb.RelPermalink }}" {{ with .Get "caption" }}alt="{{.}}"{{ end }}/>
+      <img itemprop="thumbnail" src="{{ $thumb.RelPermalink }}" {{ with .Get "caption" }}alt="{{ . | markdownify }}"{{ end }}/>
     </div>
     <a href="{{ $src.RelPermalink }}" itemprop="contentUrl" data-size="{{ $src.Width }}x{{ $src.Height }}"></a>
     {{ with .Get "caption" }}