diff -r b9dd84d35128 -r 0cdf3652748d src/pyams_portal/portlets/image/skin/image.pt
--- a/src/pyams_portal/portlets/image/skin/image.pt	Mon Jul 09 11:43:13 2018 +0200
+++ b/src/pyams_portal/portlets/image/skin/image.pt	Mon Jul 09 13:42:42 2018 +0200
@@ -1,11 +1,11 @@
 <tal:if condition="view.settings.image">
 	<picture
 		tal:define="image view.settings.image;
-					image_url extension:absolute_url(image);
+					image_url tales:absolute_url(image);
 					slot_config view.slot_configuration;
 					slot_width slot_config.get_width();
 					base_width 100 / 12;
-					timestamp extension:timestamp(image);">
+					timestamp tales:timestamp(image);">
 		<tal:var define="width slot_width['lg']">
 			<source media="(min-width: 1200px)"
 					tal:condition="width"