diff --git a/openwisp_monitoring/device/api/views.py b/openwisp_monitoring/device/api/views.py
index 5ca89e47e..c71f7e222 100644
--- a/openwisp_monitoring/device/api/views.py
+++ b/openwisp_monitoring/device/api/views.py
@@ -13,7 +13,7 @@
 from django.utils.translation import gettext_lazy as _
 from django_filters.rest_framework import DjangoFilterBackend
 from pytz import UTC
-from rest_framework import pagination, serializers, status
+from rest_framework import pagination, status
 from rest_framework.generics import (
     GenericAPIView,
     ListAPIView,
@@ -124,7 +124,7 @@ class DeviceMetricView(
         )
         .all()
     )
-    serializer_class = serializers.Serializer
+    serializer_class = MonitoringDeviceDetailSerializer
     permission_classes = [DevicePermission]
     schema = schema