diff --git a/src/redturtle/volto/restapi/deserializer/relationfield.py b/src/redturtle/volto/restapi/deserializer/relationfield.py
index 19cde60..ed0d788 100644
--- a/src/redturtle/volto/restapi/deserializer/relationfield.py
+++ b/src/redturtle/volto/restapi/deserializer/relationfield.py
@@ -2,7 +2,6 @@
 from plone.restapi.deserializer.dxfields import DefaultFieldDeserializer
 from plone.restapi.interfaces import IFieldDeserializer
 from Products.CMFCore.utils import getToolByName
-from redturtle.volto.interfaces import IRedturtleVoltoLayer
 from z3c.relationfield.interfaces import IRelationChoice
 from zope.component import adapter
 from zope.component import getMultiAdapter
@@ -10,6 +9,8 @@
 from zope.interface import implementer
 from zope.intid.interfaces import IIntIds
 
+from redturtle.volto.interfaces import IRedturtleVoltoLayer
+
 
 @implementer(IFieldDeserializer)
 @adapter(IRelationChoice, IDexterityContent, IRedturtleVoltoLayer)
@@ -35,7 +36,7 @@ def __call__(self, value):
             portal_url = portal.absolute_url()
             if value.startswith(portal_url):
                 # Resolve by URL
-                obj = portal.restrictedTraverse(value[len(portal_url) + 1 :], None)
+                obj = portal.restrictedTraverse(value[len(portal_url) + 1:], None)
                 resolved_by = "URL"
             elif value.startswith("/"):
                 # Resolve by path