diff --git a/clu/periodic_actions.py b/clu/periodic_actions.py
index 086734b..673122c 100644
--- a/clu/periodic_actions.py
+++ b/clu/periodic_actions.py
@@ -18,6 +18,7 @@
 import collections
 import concurrent.futures
 import contextlib
+import functools
 import os
 import time
 from typing import Callable, Iterable, Optional, Sequence
@@ -410,15 +411,18 @@ def _apply(self, step: int, t: float):
   def _start_session(self):
     profiler.collect(
         logdir=self._logdir,
-        callback=self._end_session,
+        # Callback is executed asynchronously, so bind `self._previous_step`
+        callback=functools.partial(self._end_session, step=self._previous_step),
         hosts=self._hosts,
-        duration_ms=self._profile_duration_ms)
+        duration_ms=self._profile_duration_ms,
+    )
 
-  def _end_session(self, url: Optional[str]):
+  def _end_session(self, url: Optional[str], *, step: int):
     platform.work_unit().create_artifact(
         platform.ArtifactType.URL,
         url,
-        description=f"[{self._previous_step}] Profile")
+        description=f"[{step}] Profile",
+    )
 
 
 class PeriodicCallback(PeriodicAction):