--- a/src/pyams_content/reference/pictograms/zmi/templates/pictogram-header.pt	Wed Jun 20 08:24:22 2018 +0200
+++ b/src/pyams_content/reference/pictograms/zmi/templates/pictogram-header.pt	Wed Jun 20 08:24:53 2018 +0200
@@ -1,7 +1,7 @@
 <div class="padding-5" i18n:domain="pyams_content">
 	<tal:var define="image i18n:context.image"
 			 condition="image"
-			 content="structure extension:thumbnail(image, 32, 'auto')" />
+			 content="structure extension:thumbnail(image, 32, 32)" />
 	<span class="padding-left-5" tal:define="header i18n:context.header"
 		  i18n:translate="">Default header:
 		<strong i18n:name="header" tal:content="header or '--'" />