diff --git a/netbox/netbox/api/viewsets/__init__.py b/netbox/netbox/api/viewsets/__init__.py
index 09cee95bc..2f0431efa 100644
--- a/netbox/netbox/api/viewsets/__init__.py
+++ b/netbox/netbox/api/viewsets/__init__.py
@@ -34,6 +34,8 @@ class BaseViewSet(GenericViewSet):
     """
     Base class for all API ViewSets. This is responsible for the enforcement of object-based permissions.
     """
+    brief = False
+
     def initial(self, request, *args, **kwargs):
         super().initial(request, *args, **kwargs)
 
@@ -42,6 +44,13 @@ class BaseViewSet(GenericViewSet):
             if action := HTTP_ACTIONS[request.method]:
                 self.queryset = self.queryset.restrict(request.user, action)
 
+    def initialize_request(self, request, *args, **kwargs):
+
+        # Annotate whether brief mode is active
+        self.brief = request.method == 'GET' and request.GET.get('brief')
+
+        return super().initialize_request(request, *args, **kwargs)
+
     def get_queryset(self):
         qs = super().get_queryset()
         serializer_class = self.get_serializer_class()
@@ -77,7 +86,6 @@ class BaseViewSet(GenericViewSet):
 
 
 class NetBoxReadOnlyModelViewSet(
-    mixins.BriefModeMixin,
     mixins.CustomFieldsMixin,
     mixins.ExportTemplatesMixin,
     drf_mixins.RetrieveModelMixin,
@@ -91,7 +99,6 @@ class NetBoxModelViewSet(
     mixins.BulkUpdateModelMixin,
     mixins.BulkDestroyModelMixin,
     mixins.ObjectValidationMixin,
-    mixins.BriefModeMixin,
     mixins.CustomFieldsMixin,
     mixins.ExportTemplatesMixin,
     drf_mixins.CreateModelMixin,
diff --git a/netbox/netbox/api/viewsets/mixins.py b/netbox/netbox/api/viewsets/mixins.py
index 7484c91cd..9d8286968 100644
--- a/netbox/netbox/api/viewsets/mixins.py
+++ b/netbox/netbox/api/viewsets/mixins.py
@@ -9,7 +9,6 @@ from extras.models import ExportTemplate
 from netbox.api.serializers import BulkOperationSerializer
 
 __all__ = (
-    'BriefModeMixin',
     'BulkDestroyModelMixin',
     'BulkUpdateModelMixin',
     'CustomFieldsMixin',
@@ -19,20 +18,6 @@ __all__ = (
 )
 
 
-class BriefModeMixin:
-    """
-    Enables brief mode support, so that the client can invoke a model's nested serializer by passing e.g.
-        GET /api/dcim/sites/?brief=True
-    """
-    brief = False
-
-    def initialize_request(self, request, *args, **kwargs):
-        # Annotate whether brief mode is active
-        self.brief = request.method == 'GET' and request.GET.get('brief')
-
-        return super().initialize_request(request, *args, **kwargs)
-
-
 class CustomFieldsMixin:
     """
     For models which support custom fields, populate the `custom_fields` context.