diff --git a/aleksis/apps/alsijil/templates/alsijil/partials/register_teachers_and_subjects_table.html b/aleksis/apps/alsijil/templates/alsijil/partials/register_teachers_and_subjects_table.html
index d9c3409d7ba4867f1447c4546916ea9d66d2d1c1..3bcaa20ff295b52cb3e0b530e814971999463f25 100644
--- a/aleksis/apps/alsijil/templates/alsijil/partials/register_teachers_and_subjects_table.html
+++ b/aleksis/apps/alsijil/templates/alsijil/partials/register_teachers_and_subjects_table.html
@@ -1,7 +1,7 @@
 <table id="lessons">
   <thead>
   <tr>
-    {% if len(groups) > 1 %}
+    {% if groups|length > 1 %}
       <th>{% trans 'Group' %}</th>
     {% endif %}
     <th>{% trans 'Subject' %}</th>
@@ -14,7 +14,7 @@
   {% for group in groups %}
     {% for course in group.courses.all %}
       <tr>
-        {% if len(groups) > 1 %}
+        {% if groups|length > 1 %}
           <td>{{ group.name }}</td>
         {% endif %}
         <td>{{ course.subject.name }}</td>