diff -r c5e34981deac -r 885d64d94aed src/pyams_portal/portlets/html/zmi/__init__.py
--- a/src/pyams_portal/portlets/html/zmi/__init__.py	Tue Aug 28 15:42:39 2018 +0200
+++ b/src/pyams_portal/portlets/html/zmi/__init__.py	Thu Aug 30 10:09:00 2018 +0200
@@ -61,7 +61,7 @@
 
 
 @adapter_config(context=(Interface, IPyAMSLayer, Interface, IRawPortletSettings), provides=IPortletPreviewer)
-@template_config(template='preview.pt', layer=IPyAMSLayer)
+@template_config(template='raw-preview.pt', layer=IPyAMSLayer)
 class RawPortletPreviewer(PortletPreviewer):
     """Raw HTML portlet previewer"""
 
@@ -84,6 +84,6 @@
 
 
 @adapter_config(context=(Interface, IPyAMSLayer, Interface, IHTMLPortletSettings), provides=IPortletPreviewer)
-@template_config(template='preview.pt', layer=IPyAMSLayer)
+@template_config(template='html-preview.pt', layer=IPyAMSLayer)
 class HTMLPortletPreviewer(PortletPreviewer):
     """Rich text portlet previewer"""