diff --git a/rdagent/scenarios/qlib/developer/factor_runner.py b/rdagent/scenarios/qlib/developer/factor_runner.py
index e6cc04d6..7ff8e525 100644
--- a/rdagent/scenarios/qlib/developer/factor_runner.py
+++ b/rdagent/scenarios/qlib/developer/factor_runner.py
@@ -1,3 +1,4 @@
+import os
 from pathlib import Path
 """
 Qlib Factor Runner - Executes factor backtests in Docker.