diff --git a/bda/admin.py b/bda/admin.py
index 8af71d00..07d082d1 100644
--- a/bda/admin.py
+++ b/bda/admin.py
@@ -38,6 +38,7 @@ class ParticipantAdmin(admin.ModelAdmin):
     actions = ['send_attribs',]
     actions_on_bottom = True
     list_per_page = 400
+    readonly_fields = ("total",)
 
     def send_attribs(self, request, queryset):
         for member in queryset.all():