diff --git a/app/scodoc/sco_report.py b/app/scodoc/sco_report.py
index 95f2251721..9166e2b4ae 100644
--- a/app/scodoc/sco_report.py
+++ b/app/scodoc/sco_report.py
@@ -1594,7 +1594,6 @@ def formsemestre_graph_parcours(
             % MAX_ETUD_IN_DESCR,
             html_sco_header.sco_footer(context, REQUEST),
         ]
-        REQUEST.RESPONSE.setHeader("content-type", "application/xhtml+xml")
         return "\n".join(H)
     else:
         raise ValueError("invalid format: %s" % format)