diff --git a/layouts/shortcodes/video.html b/layouts/shortcodes/video.html
index fde6de3..ede2c0e 100644
--- a/layouts/shortcodes/video.html
+++ b/layouts/shortcodes/video.html
@@ -8,16 +8,16 @@
 <figure>
     <video autoplay loop controls style="max-width: 100%;">
         {{ if $h265 }}
-            <source src='{{ $h265 }}' />
+            <source src='{{ $h265 }}' type="video/mp4" />
         {{ end }}
         {{ if $h264 }}
-            <source src='{{ $h264 }}' />
+            <source src='{{ $h264 }}' type="video/mp4" />
         {{ end }}
         {{ if $vp9 }}
-            <source src='{{ $vp9 }}' />
+            <source src='{{ $vp9 }}' type="video/webm" />
         {{ end }}
         {{ if $vp8 }}
-            <source src='{{ $vp8 }}' />
+            <source src='{{ $vp8 }}' type="video/webm" />
         {{ end }}
     </video>
     {{ if or $caption $attr }}