Parse xml error when comment isn't encoding in utf8

Our sources are encoding in ANSI and some comments contain accent.
Sonar can't parse the xml report !

full stacktrace :
Caused by: org.sonar.plugins.api.maven.xml.XmlParserException: can not parse xml : <?xml version="1.0" encoding="UTF-8"?><report>
<tags>
<tag name="@todo" count="0" />
<tag name="@deprecrated" count="0" />
<tag name="FIXME" count="0" />
<tag name="TODO" count="2">
<files>
<file name="org.my.project.MyTransformer" count="2">
<comments>
<comment>
<lineNumber>173</lineNumber>
<comment>Améliorer la prise en charge des types de produits</comment>
</comment>
<comment>
<lineNumber>174</lineNumber>
<comment>Interpréter le type selon le contenu des champs</comment>
</comment>
</comments>
</file>
</files>
</tag>
<tag name="NO_PMD" count="0" />
</tags>
</report>
at org.sonar.plugins.api.maven.xml.XpathParser.parse(XpathParser.java:119)
at org.sonar.plugins.api.maven.xml.XpathParser.parse(XpathParser.java:108)
at org.sonar.plugins.api.maven.xml.XpathParser.parse(XpathParser.java:92)
at org.sonar.plugins.taglist.TaglistViolationsXmlParser.populateTaglistViolation(TaglistViolationsXmlParser.java:56)
at org.sonar.plugins.taglist.TaglistMavenCollector.collect(TaglistMavenCollector.java:60)
at org.sonar.mojo.InternalMojo.executeCollectors(InternalMojo.java:294)
at org.sonar.mojo.InternalMojo.processModules(InternalMojo.java:176)
at org.sonar.mojo.InternalMojo.execute(InternalMojo.java:160)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
at org.codehaus.mojo.sonar.Bootstraper.executeMojo(Bootstraper.java:82)
... 20 more
Caused by: org.xml.sax.SAXParseException: Invalid byte 2 of 3-byte UTF-8 sequence.
at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:98)
at org.sonar.plugins.api.maven.xml.XpathParser.parse(XpathParser.java:114)
... 29 more