diff --git a/aerich/migrate.py b/aerich/migrate.py
index 60d23aa..3a5abfe 100644
--- a/aerich/migrate.py
+++ b/aerich/migrate.py
@@ -347,7 +347,9 @@ class Migrate:
                             cls._add_operator(
                                 cls._alter_null(new_model, new_field), upgrade=upgrade
                             )
-                        if new_field.default != old_field.default:
+                        if new_field.default != old_field.default and not callable(
+                            new_field.default
+                        ):
                             cls._add_operator(
                                 cls._alter_default(new_model, new_field), upgrade=upgrade
                             )