diff --git a/vilesci/lehre/lehrveranstaltung_details.php b/vilesci/lehre/lehrveranstaltung_details.php
index 83aa600c9..4bdadf89e 100644
--- a/vilesci/lehre/lehrveranstaltung_details.php
+++ b/vilesci/lehre/lehrveranstaltung_details.php
@@ -196,7 +196,7 @@
 		$htmlstr .= "		</select></td>\n";
 		$htmlstr .= "		<td>Lehrform</td>";
 		$htmlstr .= "		<td><select name='lehrform'>\n";
-		$htmlstr .= "				<option value='NULL'></option>";
+		$htmlstr .= "				<option value=''></option>";
 		foreach ($lehrform_arr as $lehrform)
 		{
 			if ($lv->lehrform_kurzbz == $lehrform)
@@ -299,4 +299,4 @@
 ?>
 
 </body>
-</html>
\ No newline at end of file
+</html>