--- a/src/pyams_file/widget/templates/media-display.pt	Sat Jun 23 13:02:47 2018 +0200
+++ b/src/pyams_file/widget/templates/media-display.pt	Wed Jun 27 12:19:42 2018 +0200
@@ -10,10 +10,10 @@
 					   target python:thumbnails.get_thumbnail('800x600', 'jpeg');"
 		   tal:attributes="href extension:absolute_url(target);"
 		   title="Zoom image" i18n:attributes="title">
-			<img class="thumbnail"
+			<img class="thumbnail" title="" src="" alt=""
 				 tal:define="thumbnail python:thumbnails.get_thumbnail('128x128');"
-				 tal:attributes="src extension:absolute_url(thumbnail);
-								 title i18n:value.title;" title="" src="" alt="" />
+				 tal:attributes="src string:${extension:absolute_url(thumbnail)}?_=${extension:timestamp(thumbnail)};
+								 title i18n:value.title;" />
 		</a>
 		<tal:if condition="python:value.content_type.startswith('image/')">
 			<div class="margin-top-5">