diff --git a/biscuit/apps/chronos/templates/chronos/edit_substitution.html b/biscuit/apps/chronos/templates/chronos/edit_substitution.html
index 2a6d879d488e96149fa35c4df2ebef9483d3fca4..054b9117ae1f9235cf5a6a3746561767f4ae39a8 100644
--- a/biscuit/apps/chronos/templates/chronos/edit_substitution.html
+++ b/biscuit/apps/chronos/templates/chronos/edit_substitution.html
@@ -21,7 +21,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_substitution_form %}
-    <button type="submit" class="btn btn-primary">
+    <button type="submit" class="btn btn-secondary">
       {% blocktrans %}Save{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/apps/chronos/templates/chronos/tt_week.html b/biscuit/apps/chronos/templates/chronos/tt_week.html
index 6cf862bec398245fc2f089548eb17bc4e7d843f1..672bbaeddfeab070ca653905001fc98e8b3850c4 100644
--- a/biscuit/apps/chronos/templates/chronos/tt_week.html
+++ b/biscuit/apps/chronos/templates/chronos/tt_week.html
@@ -31,7 +31,7 @@
     <ul id="timetable_select_form">
       {{ select_form.as_ul }}
     </ul>
-    <button type="submit" class="btn btn-primary">
+    <button type="submit" class="btn btn-secondary">
       {% blocktrans %}Select{% endblocktrans %}
     </button>
   </form>