diff --git a/netbox/dcim/api/serializers.py b/netbox/dcim/api/serializers.py
index 2959aa901..4c9c10804 100644
--- a/netbox/dcim/api/serializers.py
+++ b/netbox/dcim/api/serializers.py
@@ -618,10 +618,11 @@ class PeerInterfaceSerializer(serializers.ModelSerializer):
     url = serializers.HyperlinkedIdentityField(view_name='dcim-api:interface-detail')
     device = NestedDeviceSerializer()
     form_factor = ChoiceFieldSerializer(choices=IFACE_FF_CHOICES)
+    lag = NestedInterfaceSerializer()
 
     class Meta:
         model = Interface
-        fields = ['id', 'url', 'device', 'name', 'form_factor', 'mac_address', 'mgmt_only', 'description']
+        fields = ['id', 'url', 'device', 'name', 'form_factor', 'lag', 'mac_address', 'mgmt_only', 'description']
 
 
 class WritableInterfaceSerializer(serializers.ModelSerializer):