diff --git a/product/ERP5OOo/transforms/html_to_odt.py b/product/ERP5OOo/transforms/html_to_odt.py
index ee1d525e8b700f600851287bf1a7923953311c0b..74f374020549e877d076ee759c95ff5d0766a209 100644
--- a/product/ERP5OOo/transforms/html_to_odt.py
+++ b/product/ERP5OOo/transforms/html_to_odt.py
@@ -32,17 +32,8 @@ class HTMLToOdt:
   def convert(self, orig, data, cache=None, filename=None, context=None, **kwargs):
     # Try to recover broken HTML documents, specially regarding encoding used
     html_node = etree.XML(orig, parser=html_parser)
-    html_tree = html_node.getroottree()
-    head = html_tree.find('head')
-    if head is None:
-      # This part of code is supposed to be useless
-      # lxml.html.tostring function with include_meta_content_type
-      # parameter to True, should do the same things. But it does not.
-      head = Element('head')
-      html_node.insert(0, head)
-      SubElement(head, 'meta', **{'http-equiv': 'Content-Type',
-                                  'content': 'text/html; charset=utf-8'})
-    orig = html.tostring(html_node, encoding='utf-8', method='xml')
+    orig = html.tostring(html_node, encoding='utf-8', method='xml',
+                         include_meta_content_type=True)
 
     # workaround a Bug in LibreOffice HTML import filter.
     # https://bugs.freedesktop.org/show_bug.cgi?id=36080
diff --git a/product/ERP5OOo/transforms/oood_commandtransform.py b/product/ERP5OOo/transforms/oood_commandtransform.py
index e70d3d4b0f3586dc96ee5d34030ac20e24049a98..ae5b3c1d1a556ac603fd77221ca14645cc80410a 100644
--- a/product/ERP5OOo/transforms/oood_commandtransform.py
+++ b/product/ERP5OOo/transforms/oood_commandtransform.py
@@ -194,7 +194,8 @@ class OOOdCommandTransform(commandtransform):
           parent_node.append(style_node)
           style_node.attrib.update({'type': 'text/css'})
           parent_node.remove(css_link_tag)
-    xml_output = html.tostring(xml_doc, encoding='utf-8', method='xml')
+    xml_output = html.tostring(xml_doc, encoding='utf-8', method='xml',
+                               include_meta_content_type=True)
     xml_output = xml_output.replace('<title/>', '<title></title>')
     return xml_output