diff --git a/nummi/history/templates/history/plot.html b/nummi/history/templates/history/plot.html
index 680686d..9d79dc8 100644
--- a/nummi/history/templates/history/plot.html
+++ b/nummi/history/templates/history/plot.html
@@ -59,12 +59,12 @@
         </thead>
         <tbody>
             {% regroup history.data by month.year as years_list %}
-            {% for y, year in years_list reversed %}
+            {% for y, y_data in years_list reversed %}
                 <tr>
                     {% if not year %}
                         <th class="date" scope="row">{% year_url y %}</th>
                     {% endif %}
-                    {% for m in year %}
+                    {% for m in y_data %}
                         {% if forloop.parentloop.last and forloop.first %}
                         {% empty_calendar_cells_start m.month.month %}
                         {% endif %}