diff --git a/orion/benchmark.py b/orion/benchmark.py
index ed821441..cf8e75ba 100644
--- a/orion/benchmark.py
+++ b/orion/benchmark.py
@@ -448,8 +448,8 @@ def main(pipelines, datasets, resume, workers, output_path, cache_dir, pipeline_
 
     parser.add_argument('-o', '--output_path', type=str, default='results.csv')
     parser.add_argument('-c', '--cache_dir', type=str, default='cache')
-    parser.add_argument('-pd', '--pipeline_dir', type=str, default='pipeline_dir')
     parser.add_argument('-ad', '--anomaly_dir', type=str, default='anomaly_dir')
+    parser.add_argument('-pd', '--pipeline_dir', type=str, default=None)
 
     config = parser.parse_args()