diff --git a/lib/oban/migration.ex b/lib/oban/migration.ex
index 61bdcac8..5120eecd 100644
--- a/lib/oban/migration.ex
+++ b/lib/oban/migration.ex
@@ -194,6 +194,7 @@ defmodule Oban.Migration do
     case repo().__adapter__() do
       Ecto.Adapters.Postgres -> Oban.Migrations.Postgres
       Ecto.Adapters.SQLite3 -> Oban.Migrations.SQLite
+      _ -> Map.fetch!(repo().config(), :migrator)
     end
   end
 end