diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index afdc7bb4cd..b8a9b7a50c 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -3078,9 +3078,11 @@ void Heap::AdjustLiveBytes(HeapObject* object, int by, InvocationMode mode) {
   // the heap using HeapIterator, we can update the live byte count. We cannot
   // 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 (lo_space()->Contains(object)) {
+    lo_space()->AdjustLiveBytes(by);
+  } else 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);
     } else {
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index c8c4d3f5bb..67e9aae114 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -3057,6 +3057,8 @@ class LargeObjectSpace : public Space {
   // Checks whether the space is empty.
   bool IsEmpty() { return first_page_ == NULL; }
 
+  void AdjustLiveBytes(int by) { objects_size_ += by; }
+
   LargePage* first_page() { return first_page_; }
 
 #ifdef VERIFY_HEAP
diff --git a/test/cctest/heap/test-heap.cc b/test/cctest/heap/test-heap.cc
index 030ef5c616..14c91153c7 100644
--- a/test/cctest/heap/test-heap.cc
+++ b/test/cctest/heap/test-heap.cc
@@ -6743,5 +6743,18 @@ TEST(Regress598319) {
   }
 }
 
+TEST(Regress609761) {
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
+  Heap* heap = CcTest::heap();
+  Isolate* isolate = heap->isolate();
+
+  intptr_t size_before = heap->SizeOfObjects();
+  Handle<FixedArray> array = isolate->factory()->NewFixedArray(200000);
+  array->Shrink(1);
+  intptr_t size_after = heap->SizeOfObjects();
+  CHECK_EQ(size_after, size_before + array->Size());
+}
+
 }  // namespace internal
 }  // namespace v8