diff --git a/themes/media-vimeo-universal.tpl.php b/themes/media-vimeo-universal.tpl.php
index b0386df..67a9184 100644
--- a/themes/media-vimeo-universal.tpl.php
+++ b/themes/media-vimeo-universal.tpl.php
@@ -21,5 +21,5 @@
  */
 ?>
 <?php if ($iframe_url) : ?>
-  <iframe src="<?php print $iframe_url; ?>" width="<?php print $width; ?>" height="<?php print $height; ?>" frameborder="0"></iframe>
+  <iframe src="<?php print $iframe_url; ?>" width="<?php print $width; ?>" height="<?php print $height; ?>" frameborder="0" <?php print ($fullscreen ? "allowfullscreen" : "") ?>></iframe>
 <?php endif; ?>