diff --git a/django/db/models/manipulators.py b/django/db/models/manipulators.py
index daca9d710504f..83ddda844e4fd 100644
--- a/django/db/models/manipulators.py
+++ b/django/db/models/manipulators.py
@@ -218,7 +218,7 @@ def save(self, new_data):
                                 new_value = rel_new_data[f.attname]
                                 if f.rel.raw_id_admin:
                                     new_value = new_value[0]
-                                setattr(new_rel_obj, f.name, f.rel.to.objects.filter(pk__in=rel_new_data[f.attname]))
+                                setattr(new_rel_obj, f.name, f.rel.to.objects.filter(pk__in=new_value))
                                 if self.change:
                                     self.fields_changed.append('%s for %s "%s"' % (f.verbose_name, related.opts.verbose_name, new_rel_obj))