diff --git a/netbox/dcim/api/serializers_/cables.py b/netbox/dcim/api/serializers_/cables.py
index 809a07d2c..c5d78d924 100644
--- a/netbox/dcim/api/serializers_/cables.py
+++ b/netbox/dcim/api/serializers_/cables.py
@@ -16,14 +16,27 @@ __all__ = (
     'CableSerializer',
     'CableTerminationSerializer',
     'CabledObjectSerializer',
+    'GenericObjectTerminationSerializer',
     'TracedCableSerializer',
 )
 
 
+class GenericObjectTerminationSerializer(GenericObjectSerializer):
+    id = serializers.IntegerField(required=False)
+
+    def to_representation(self, instance):
+        data = super().to_representation(instance)
+        termination = instance.cable_terminations.first()
+        if termination:
+            data['id'] = termination.pk
+
+        return data
+
+
 class CableSerializer(NetBoxModelSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='dcim-api:cable-detail')
-    a_terminations = GenericObjectSerializer(many=True, required=False)
-    b_terminations = GenericObjectSerializer(many=True, required=False)
+    a_terminations = GenericObjectTerminationSerializer(many=True, required=False)
+    b_terminations = GenericObjectTerminationSerializer(many=True, required=False)
     status = ChoiceField(choices=LinkStatusChoices, required=False)
     tenant = TenantSerializer(nested=True, required=False, allow_null=True)
     length_unit = ChoiceField(choices=CableLengthUnitChoices, allow_blank=True, required=False, allow_null=True)
diff --git a/netbox/dcim/tests/test_api.py b/netbox/dcim/tests/test_api.py
index 52b850b24..435581c7e 100644
--- a/netbox/dcim/tests/test_api.py
+++ b/netbox/dcim/tests/test_api.py
@@ -2038,6 +2038,14 @@ class CableTest(APIViewTestCases.APIViewTestCase):
             },
         ]
 
+    def test_cable_termination_pk_exist(self):
+        self.add_permissions('dcim.view_cable')
+        cable = Cable.objects.first()
+        url = reverse('dcim-api:cable-detail', kwargs={'pk': cable.pk})
+        response = self.client.get(url, {}, format='json', **self.header)
+        self.assertHttpStatus(response, status.HTTP_200_OK)
+        self.assertIsNotNone(response.data['a_terminations'][0]['id'])
+
 
 class ConnectedDeviceTest(APITestCase):