diff --git a/tapeagents/agent.py b/tapeagents/agent.py
index 321982b2..04bb6f89 100644
--- a/tapeagents/agent.py
+++ b/tapeagents/agent.py
@@ -711,7 +711,6 @@ def run_batch(self: Agent[TapeType], tapes: list[TapeType]) -> list[Tape]:
         if not isinstance(self.llm, TrainableLLM):
             raise NotImplementedError("For run_agent_batch the LLM must be TrainableLLM")
         original_tapes = list(tapes)
-        parent_ids = [tape.metadata.id for tape in tapes]
         n_iterations = 0
         active_indices = set(range(len(tapes)))
         while n_iterations < self.max_iterations:
@@ -737,7 +736,7 @@ def run_batch(self: Agent[TapeType], tapes: list[TapeType]) -> list[Tape]:
             n_iterations += 1
         for i in range(len(tapes)):
             updated_metadata = original_tapes[i].metadata.model_validate(dict(
-                parent_id=parent_ids[i],
+                parent_id=original_tapes[i].metadata.id,
                 author=self.name,
                 n_added_steps=len(tapes[i]) - len(original_tapes[i])
             ))