diff --git a/apps/establishment/admin.py b/apps/establishment/admin.py
index 0397c407..8acadc02 100644
--- a/apps/establishment/admin.py
+++ b/apps/establishment/admin.py
@@ -11,12 +11,12 @@ from review import models as review_models
 
 
 @admin.register(models.EstablishmentType)
-class EstablishmentTypeAdmin(BaseModelAdminMixin):
+class EstablishmentTypeAdmin(BaseModelAdminMixin, admin.ModelAdmin):
     """EstablishmentType admin."""
 
 
 @admin.register(models.EstablishmentSubType)
-class EstablishmentSubTypeAdmin(BaseModelAdminMixin):
+class EstablishmentSubTypeAdmin(BaseModelAdminMixin, admin.ModelAdmin):
     """EstablishmentSubType admin."""
 
 
@@ -37,7 +37,7 @@ class ContactEmailInline(admin.TabularInline):
     extra = 0
 
 
-class ReviewInline(GenericTabularInline):
+class ReviewInline(BaseModelAdminMixin, GenericTabularInline):
     model = review_models.Review
     extra = 0
 
@@ -48,7 +48,7 @@ class CommentInline(GenericTabularInline):
 
 
 @admin.register(models.Establishment)
-class EstablishmentAdmin(BaseModelAdminMixin):
+class EstablishmentAdmin(BaseModelAdminMixin, admin.ModelAdmin):
     """Establishment admin."""
     list_display = ['id', '__str__', 'image_tag', ]
     inlines = [
@@ -59,7 +59,7 @@ class EstablishmentAdmin(BaseModelAdminMixin):
 
 
 @admin.register(models.Position)
-class PositionAdmin(BaseModelAdminMixin):
+class PositionAdmin(BaseModelAdminMixin, admin.ModelAdmin):
     """Position admin."""
 
 
@@ -70,7 +70,7 @@ class PlateInline(admin.TabularInline):
 
 
 @admin.register(models.Menu)
-class MenuAdmin(BaseModelAdminMixin):
+class MenuAdmin(BaseModelAdminMixin, admin.ModelAdmin):
     """Menu admin."""
     list_display = ['id', 'category_translated']
     inlines = [
diff --git a/apps/news/admin.py b/apps/news/admin.py
index 90527ea4..cc48a887 100644
--- a/apps/news/admin.py
+++ b/apps/news/admin.py
@@ -25,7 +25,7 @@ send_email_action.short_description = "Send the selected news by email"
 
 
 @admin.register(models.News)
-class NewsAdmin(BaseModelAdminMixin):
+class NewsAdmin(BaseModelAdminMixin, admin.ModelAdmin):
     """News admin."""
     raw_id_fields = ('address',)
     actions = [send_email_action]
diff --git a/apps/review/admin.py b/apps/review/admin.py
index 03c2419a..2a7326ae 100644
--- a/apps/review/admin.py
+++ b/apps/review/admin.py
@@ -5,5 +5,5 @@ from utils.admin import BaseModelAdminMixin
 
 
 @admin.register(models.Review)
-class ReviewAdminModel(BaseModelAdminMixin):
+class ReviewAdminModel(BaseModelAdminMixin, admin.ModelAdmin):
     """Admin model for model Review."""
diff --git a/apps/utils/admin.py b/apps/utils/admin.py
index 43680e20..fd5e353f 100644
--- a/apps/utils/admin.py
+++ b/apps/utils/admin.py
@@ -1,9 +1,8 @@
 """Mixins for admin models."""
-from django.contrib import admin
 from django.db.models import ForeignKey
 
 
-class BaseModelAdminMixin(admin.ModelAdmin):
+class BaseModelAdminMixin:
     """
     Class that overridden ModelAdmin and adds to readonly_fields attr
     persisted fields like created_by, modified_by.