diff --git a/wagtail/wagtailadmin/edit_handlers.py b/wagtail/wagtailadmin/edit_handlers.py
index 43d9e044d..7462d388d 100644
--- a/wagtail/wagtailadmin/edit_handlers.py
+++ b/wagtail/wagtailadmin/edit_handlers.py
@@ -486,7 +486,7 @@ class BaseChooserPanel(BaseFieldPanel):
 
     def get_chosen_item(self):
         field = self.instance._meta.get_field(self.field_name)
-        related_model = field.related.model
+        related_model = field.rel.model
         try:
             return getattr(self.instance, self.field_name)
         except related_model.DoesNotExist:
diff --git a/wagtail/wagtailsnippets/edit_handlers.py b/wagtail/wagtailsnippets/edit_handlers.py
index 7e788d6df..4c71d58dd 100644
--- a/wagtail/wagtailsnippets/edit_handlers.py
+++ b/wagtail/wagtailsnippets/edit_handlers.py
@@ -40,7 +40,7 @@ class BaseSnippetChooserPanel(BaseChooserPanel):
                         .format(cls.__name__, cls.snippet_type)
                     )
             else:
-                cls._target_model = cls.model._meta.get_field(cls.field_name).rel.to
+                cls._target_model = cls.model._meta.get_field(cls.field_name).rel.model
 
         return cls._target_model