diff --git a/cis/private/lehre/notenliste.xls.php b/cis/private/lehre/notenliste.xls.php
index 52b18b056..62b896e43 100644
--- a/cis/private/lehre/notenliste.xls.php
+++ b/cis/private/lehre/notenliste.xls.php
@@ -351,7 +351,7 @@ if (!$berechtigung->isBerechtigt('admin')
 					{
 						$worksheet->write($lines,3,$elem->vorname);
 					}
-					$worksheet->write($lines,4,$elem->semester.$elem->verband.$elem->gruppe);
+					$worksheet->writeString($lines,4,$elem->semester.$elem->verband.$elem->gruppe);
 					$worksheet->write($lines,5,trim($elem->matrikelnr),$format_highlight);
 					$worksheet->write($lines,6, $note, $format_highlightright);