diff --git a/django_x509/base/admin.py b/django_x509/base/admin.py
index 818519b..23a3887 100644
--- a/django_x509/base/admin.py
+++ b/django_x509/base/admin.py
@@ -1,13 +1,14 @@
 from django import forms
 from django.conf.urls import url
 from django.contrib.admin import ModelAdmin
-from django.shortcuts import render
+from django.http import HttpResponse
+from django.shortcuts import get_object_or_404, render
 from django.urls import reverse
 from django.utils.html import format_html
 from django.utils.translation import ngettext
 from django.utils.translation import ugettext_lazy as _
 
-from .mixin import CrlDownloadMixin
+from django_x509 import settings as app_settings
 
 
 class X509Form(forms.ModelForm):
@@ -96,7 +97,7 @@ def get_context(self, data, ca_count=0, cert_count=0):
         return context
 
 
-class AbstractCaAdmin(BaseAdmin, CrlDownloadMixin):
+class AbstractCaAdmin(BaseAdmin):
     list_filter = ['key_length', 'digest', 'created']
     fields = [
         'operation_type',
@@ -131,6 +132,16 @@ def get_urls(self):
             url(r'^x509/ca/(?P<pk>[^/]+).crl$', self.crl_view, name='crl')
         ] + super().get_urls()
 
+    def crl_view(self, request, pk):
+        authenticated = request.user.is_authenticated
+        authenticated = authenticated() if callable(authenticated) else authenticated
+        if app_settings.CRL_PROTECTED and not authenticated:
+            return HttpResponse(_('Forbidden'), status=403, content_type='text/plain')
+        instance = get_object_or_404(self.model, pk=pk)
+        return HttpResponse(
+            instance.crl, status=200, content_type='application/x-pem-file'
+        )
+
     def renew_ca(self, request, queryset):
         if request.POST.get('post'):
             renewed_rows = 0
diff --git a/django_x509/base/mixin.py b/django_x509/base/mixin.py
deleted file mode 100644
index a82afd1..0000000
--- a/django_x509/base/mixin.py
+++ /dev/null
@@ -1,17 +0,0 @@
-from django.http import HttpResponse
-from django.shortcuts import get_object_or_404
-from django.utils.translation import ugettext_lazy as _
-
-from django_x509 import settings as app_settings
-
-
-class CrlDownloadMixin:
-    def crl_view(self, request, pk):
-        authenticated = request.user.is_authenticated
-        authenticated = authenticated() if callable(authenticated) else authenticated
-        if app_settings.CRL_PROTECTED and not authenticated:
-            return HttpResponse(_('Forbidden'), status=403, content_type='text/plain')
-        instance = get_object_or_404(self.model, pk=pk)
-        return HttpResponse(
-            instance.crl, status=200, content_type='application/x-pem-file'
-        )