diff --git a/optuna/storages/_rdb/storage.py b/optuna/storages/_rdb/storage.py
index 7910d86149..430903645f 100644
--- a/optuna/storages/_rdb/storage.py
+++ b/optuna/storages/_rdb/storage.py
@@ -459,7 +459,7 @@ def _create_new_trial(
                     if n_retries > 2:
                         raise
 
-            n_retries += 1
+                n_retries += 1
 
             if template_trial:
                 frozen = copy.deepcopy(template_trial)