--- a/src/pyams_portal/zmi/portlet.py	Fri Oct 05 15:49:10 2018 +0200
+++ b/src/pyams_portal/zmi/portlet.py	Mon Oct 08 12:22:39 2018 +0200
@@ -172,6 +172,7 @@
 
     prefix = 'portlet_renderer_properties.'
 
+    dialog_class = 'modal-large'
     legend = _("Edit renderer properties")
     icon_css_class = 'fa fa-fw fa-pencil-square-o'