diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 0ee88a0398..627a829b83 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3109,6 +3109,7 @@ void Heap::AdjustLiveBytes(HeapObject* object, int by, InvocationMode mode) {
   // update while using HeapIterator because the iterator is temporarily
   // marking the whole object graph, without updating live bytes.
   if (!in_heap_iterator() &&
+      !mark_compact_collector()->sweeping_in_progress() &&
       Marking::IsBlack(Marking::MarkBitFrom(object->address()))) {
     if (mode == SEQUENTIAL_TO_SWEEPER) {
       MemoryChunk::IncrementLiveBytesFromGC(object, by);
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 6025e298ea..9ba2d5a340 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3982,6 +3982,7 @@ void MarkCompactCollector::SweepSpaces() {
   MoveEvacuationCandidatesToEndOfPagesList();
 
   {
+    sweeping_in_progress_ = true;
     {
       GCTracer::Scope sweep_scope(heap()->tracer(),
                                   GCTracer::Scope::MC_SWEEP_OLD);
@@ -3997,7 +3998,6 @@ void MarkCompactCollector::SweepSpaces() {
                                   GCTracer::Scope::MC_SWEEP_MAP);
       StartSweepSpace(heap()->map_space());
     }
-    sweeping_in_progress_ = true;
     if (FLAG_concurrent_sweeping) {
       StartSweeperThreads();
     }