diff --git a/package/samplers/auto_sampler/_sampler.py b/package/samplers/auto_sampler/_sampler.py
index 85aa971d..28e52e4c 100644
--- a/package/samplers/auto_sampler/_sampler.py
+++ b/package/samplers/auto_sampler/_sampler.py
@@ -168,7 +168,7 @@ def _determine_single_objective_sampler(
             # NOTE(nabenabe): ``CmaEsSampler`` internally falls back to ``RandomSampler`` for
             # 1D problems.
             return CmaEsSampler(
-                seed=seed, source_trials=warm_start_trials, warn_independent_sampling=False
+                seed=seed, source_trials=warm_start_trials, warn_independent_sampling=True
             )
 
         return self._sampler  # No update happens to self._sampler.