diff --git a/frontend/src/components/files/Preview.vue b/frontend/src/components/files/Preview.vue
index 0ae10e32..71d50632 100644
--- a/frontend/src/components/files/Preview.vue
+++ b/frontend/src/components/files/Preview.vue
@@ -52,7 +52,7 @@
           but don't worry, you can <a :href="download">download it</a>
           and watch it with your favorite video player!
         </video>
-        <object v-else-if="req.extension == '.pdf'" class="pdf" :data="raw"></object>
+        <object v-else-if="req.extension.toLowerCase() == '.pdf'" class="pdf" :data="raw"></object>
         <a v-else-if="req.type == 'blob'" :href="download">
           <h2 class="message">{{ $t('buttons.download') }} <i class="material-icons">file_download</i></h2>
         </a>