diff --git a/optuna_dashboard/_storage_url.py b/optuna_dashboard/_storage_url.py
index 7ee7bd01..351f9f54 100644
--- a/optuna_dashboard/_storage_url.py
+++ b/optuna_dashboard/_storage_url.py
@@ -82,9 +82,9 @@ def get_journal_file_storage(file_path: str) -> JournalStorage:
     if version.parse(optuna_ver) < version.Version("v3.1.0"):
         raise ValueError("JournalRedisStorage is available from Optuna v3.1.0")
 
+    from optuna.storages import JournalFileOpenLock
     from optuna.storages import JournalFileStorage
     from optuna.storages import JournalStorage
-    from optuna.storages import JournalFileOpenLock
 
     storage: JournalStorage
     if os.name == "nt":