diff --git a/obs/update_unstable.py b/obs/update_unstable.py
index 0796ba2..715c2ec 100755
--- a/obs/update_unstable.py
+++ b/obs/update_unstable.py
@@ -33,13 +33,13 @@ Updated at {{ date.today().strftime('%Y-%m-%d') }}
 {% for repository, update in repositories.items() %}
 ### {{ repository }}
 
-Updated {{ update | len }} packages.
+Updated {{ update | length }} packages.
 
 {% for package, remote, state in update %}
 {% if state != "error" %}
 * {{ package }} [{{ state[0:8] }}(https://commits.kde.org/{{ remote }}/{{ state }}
 {% else %}
-{ errors.append(package) }
+{%  set errors = errors + [package] %}
 {% endif %}
 {% endfor %}
 {% endfor %}