diff --git a/bt5/erp5_ical_style/SkinTemplateItem/portal_skins/erp5_ical_style/template_ical_style.xml b/bt5/erp5_ical_style/SkinTemplateItem/portal_skins/erp5_ical_style/template_ical_style.xml
index 32f0a6f7f5395d14b4afec4e404e778e16ce497a..6158aed6774edc2506feeb3d802c34592e436ac1 100644
--- a/bt5/erp5_ical_style/SkinTemplateItem/portal_skins/erp5_ical_style/template_ical_style.xml
+++ b/bt5/erp5_ical_style/SkinTemplateItem/portal_skins/erp5_ical_style/template_ical_style.xml
@@ -48,7 +48,7 @@
             <key> <string>_text</string> </key>
             <value> <string encoding="cdata"><![CDATA[
 
-<tal:block tal:define="dummy python:request.RESPONSE.setHeader(\'Content-Type\', \'text/calendar; charset=utf-8\');"\n
+<tal:block tal:define="dummy python:request.RESPONSE.setHeader(\'Content-Type\', \'text/calendar;; charset=utf-8\');"\n
 ><tal:block tal:define="listbox python:form[\'listbox\'];" \n
 ><tal:block tal:content="structure python: listbox.render()" />\n
 </tal:block>\n