diff --git a/src/v8threads.cc b/src/v8threads.cc
index 80a7cd9..02292f6 100644
--- a/src/v8threads.cc
+++ b/src/v8threads.cc
@@ -331,6 +331,17 @@
 }
 
 
+void ThreadManager::IterateThreads(ThreadVisitor* v) {
+  for (ThreadState* state = ThreadState::FirstInUse();
+       state != NULL;
+       state = state->Next()) {
+    char* data = state->data();
+    data += HandleScopeImplementer::ArchiveSpacePerThread();
+    Top::IterateThread(v, data);
+  }
+}
+
+
 void ThreadManager::MarkCompactPrologue(bool is_compacting) {
   for (ThreadState* state = ThreadState::FirstInUse();
        state != NULL;