diff --git a/src/arena-abandoned.c b/src/arena-abandoned.c
index 2a7ade72..3b1b1823 100644
--- a/src/arena-abandoned.c
+++ b/src/arena-abandoned.c
@@ -82,7 +82,9 @@ static bool mi_arena_segment_os_clear_abandoned(mi_segment_t* segment, bool take
     segment->abandoned_os_prev = NULL;
     mi_atomic_decrement_relaxed(&subproc->abandoned_count);
     mi_atomic_decrement_relaxed(&subproc->abandoned_os_list_count);
-    mi_atomic_store_release(&segment->thread_id, _mi_thread_id());
+    if (take_lock) { // don't reset the thread_id when iterating
+      mi_atomic_store_release(&segment->thread_id, _mi_thread_id());
+    }
     reclaimed = true;
   }
   if (take_lock) { mi_lock_release(&segment->subproc->abandoned_os_lock); }