diff --git a/runtime/thread_list.h b/runtime/thread_list.h
index b60fca1..70917eb 100644
--- a/runtime/thread_list.h
+++ b/runtime/thread_list.h
@@ -109,9 +109,7 @@
   // in-flight mutator heap access (eg. a read barrier.) Runnable threads will respond by
   // decrementing the empty checkpoint barrier count. This works even when the weak ref access is
   // disabled. Only one concurrent use is currently supported.
-  // In debug build, runnable_thread_ids will be populated with the thread IDS of the runnable
-  // thread to wait for.
-  size_t RunEmptyCheckpoint(std::vector<uint32_t>& runnable_thread_ids)
+  void RunEmptyCheckpoint()
       REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
 
   size_t RunCheckpointOnRunnableThreads(Closure* checkpoint_function)