diff --git a/django/forms/models.py b/django/forms/models.py
index abdb83f6a9..871c58430c 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -419,7 +419,7 @@ class BaseModelFormSet(BaseFormSet):
                      self.deleted_objects.append(obj)
                      obj.delete()
                      continue
-             if form.changed_data:
+             if form.has_changed():
                  self.changed_objects.append((obj, form.changed_data))
                  saved_instances.append(self.save_existing(form, obj, commit=commit))
                  if not commit: