diff --git a/examples/preferential-optimization/generator.py b/examples/preferential-optimization/generator.py
index 769ad96b..cfbbade2 100644
--- a/examples/preferential-optimization/generator.py
+++ b/examples/preferential-optimization/generator.py
@@ -11,7 +11,7 @@ from optuna_dashboard.artifact import get_artifact_path
 from optuna_dashboard.artifact import upload_artifact
 from optuna_dashboard.artifact.file_system import FileSystemBackend
 from optuna_dashboard.preferential import create_study
-from optuna_dashboard.preferential.samplers._gp import PreferentialGPSampler
+from optuna_dashboard.preferential.samplers.gp import PreferentialGPSampler
 from PIL import Image