diff --git a/metagpt/roles/ml_engineer.py b/metagpt/roles/ml_engineer.py
index e2203c4fb..34bd81110 100644
--- a/metagpt/roles/ml_engineer.py
+++ b/metagpt/roles/ml_engineer.py
@@ -148,7 +148,7 @@ class MLEngineer(Role):
             print(truncate_result)
             # print(result)
             self.working_memory.add(
-                Message(content=truncate_result, keep_len=_keep_result_len), role="user", cause_by=ExecutePyCode)
+                Message(content=truncate_result, role="user", cause_by=ExecutePyCode)
             )
 
             if "!pip" in code: