diff --git a/gaehsnitz/templates/suff/staff_user.html b/gaehsnitz/templates/suff/staff_user.html
index 10e69c7..dab7b23 100644
--- a/gaehsnitz/templates/suff/staff_user.html
+++ b/gaehsnitz/templates/suff/staff_user.html
@@ -54,15 +54,26 @@
         <form method="post" action="{% url 'suff:staff_book' tab_user.username %}">
             {% csrf_token %}
             <label class="for-free-toggle">
-                <input type="radio" name="booking_mode" value="for_free" />
+                <input type="checkbox" name="booking_mode" value="for_free" />
                 <span>Gratis (z.B. Artists am Spieltag)</span>
             </label>
             {% if not is_anonymous_target %}
                 <label class="for-free-toggle">
-                    <input type="radio" name="booking_mode" value="cash_paid" />
+                    <input type="checkbox" name="booking_mode" value="cash_paid" />
                     <span>Direkt bar bezahlt</span>
                 </label>
             {% endif %}
+            <script>
+            document.querySelectorAll('input[name="booking_mode"]').forEach(function(cb) {
+                cb.addEventListener('change', function() {
+                    if (this.checked) {
+                        document.querySelectorAll('input[name="booking_mode"]').forEach(function(other) {
+                            if (other !== cb) other.checked = false;
+                        });
+                    }
+                });
+            });
+            </script>
             {% regroup drinks by alcohol_label as drink_groups %}
             {% for group in drink_groups %}
                 <h4 class="drink-group-heading">{{ group.grouper }}</h4>