diff --git a/orchestra/admin/utils.py b/orchestra/admin/utils.py
index ccf22b49..764edf84 100644
--- a/orchestra/admin/utils.py
+++ b/orchestra/admin/utils.py
@@ -10,7 +10,7 @@ from django.urls import reverse, NoReverseMatch
 from django.db import models
 from django.shortcuts import redirect
 from django.utils import timezone
-from django.utils.html import escape
+from django.utils.html import escape, format_html
 from django.utils.safestring import mark_safe
 
 from orchestra.models.utils import get_field_value
@@ -158,7 +158,7 @@ def admin_date(*args, **kwargs):
         date = date.strftime("%Y-%m-%d %H:%M:%S %Z")
     else:
         date = date.strftime("%Y-%m-%d")
-    return '<span title="{0}">{1}</span>'.format(date, escape(natural))
+    return format_html('<span title="{0}">{1}</span>', date, natural)
 
 
 def get_object_from_url(modeladmin, request):
diff --git a/orchestra/contrib/accounts/admin.py b/orchestra/contrib/accounts/admin.py
index 2008fb6b..a046a4a5 100644
--- a/orchestra/contrib/accounts/admin.py
+++ b/orchestra/contrib/accounts/admin.py
@@ -207,6 +207,7 @@ class AccountAdminMixin(object):
     account = None
     list_select_related = ('account',)
 
+    @mark_safe
     def display_active(self, instance):
         if not instance.is_active:
             return '<img src="%s" alt="False">' % static('admin/img/icon-no.svg')
diff --git a/orchestra/contrib/bills/admin.py b/orchestra/contrib/bills/admin.py
index 560819c8..c7c4fc43 100644
--- a/orchestra/contrib/bills/admin.py
+++ b/orchestra/contrib/bills/admin.py
@@ -7,6 +7,7 @@ from django.db import models
 from django.db.models import F, Sum, Prefetch
 from django.db.models.functions import Coalesce
 from django.templatetags.static import static
+from django.utils.html import format_html
 from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
 from django.shortcuts import redirect
@@ -67,6 +68,7 @@ class BillLineInline(admin.TabularInline):
 
     order_link = admin_link('order', display='pk')
 
+    @mark_safe
     def display_total(self, line):
         if line.pk:
             total = line.compute_total()
@@ -242,6 +244,7 @@ class BillLineManagerAdmin(BillLineAdmin):
 
 
 class BillAdminMixin(AccountAdminMixin):
+    @mark_safe
     def display_total_with_subtotals(self, bill):
         if bill.pk:
             currency = settings.BILLS_CURRENCY.lower()
@@ -255,6 +258,7 @@ class BillAdminMixin(AccountAdminMixin):
     display_total_with_subtotals.short_description = _("total")
     display_total_with_subtotals.admin_order_field = 'approx_total'
 
+    @mark_safe
     def display_payment_state(self, bill):
         if bill.pk:
             t_opts = bill.transactions.model._meta
@@ -376,7 +380,7 @@ class BillAdmin(BillAdminMixin, ExtendedModelAdmin):
 
     def display_total(self, bill):
         currency = settings.BILLS_CURRENCY.lower()
-        return '%s &%s;' % (bill.compute_total(), currency)
+        return format_html('{} &{};', bill.compute_total(), currency)
     display_total.allow_tags = True
     display_total.short_description = _("total")
     display_total.admin_order_field = 'approx_total'
@@ -384,7 +388,7 @@ class BillAdmin(BillAdminMixin, ExtendedModelAdmin):
     def type_link(self, bill):
         bill_type = bill.type.lower()
         url = reverse('admin:bills_%s_changelist' % bill_type)
-        return '<a href="%s">%s</a>' % (url, bill.get_type_display())
+        return format_html('<a href="{}">{}</a>', url, bill.get_type_display())
     type_link.allow_tags = True
     type_link.short_description = _("type")
     type_link.admin_order_field = 'type'
diff --git a/orchestra/contrib/websites/admin.py b/orchestra/contrib/websites/admin.py
index fc54b4bc..8e597d86 100644
--- a/orchestra/contrib/websites/admin.py
+++ b/orchestra/contrib/websites/admin.py
@@ -3,6 +3,7 @@ from django.contrib import admin
 from django.urls import resolve
 from django.db.models import Q
 from django.utils.encoding import force_text
+from django.utils.safestring import mark_safe
 from django.utils.translation import ugettext_lazy as _
 
 from orchestra.admin import ExtendedModelAdmin
@@ -78,6 +79,7 @@ class WebsiteAdmin(SelectAccountAdminMixin, ExtendedModelAdmin):
     search_fields = ('name', 'account__username', 'domains__name', 'content__webapp__name')
     actions = (disable, enable, list_accounts)
 
+    @mark_safe
     def display_domains(self, website):
         domains = []
         for domain in website.domains.all():