diff --git a/Source/JavaScriptCore/heap/Heap.cpp b/Source/JavaScriptCore/heap/Heap.cpp
index 6214daf42bd16..f66dfa07faa6f 100644
--- a/Source/JavaScriptCore/heap/Heap.cpp
+++ b/Source/JavaScriptCore/heap/Heap.cpp
@@ -985,6 +985,11 @@ size_t Heap::objectCount()
     return m_objectSpace.objectCount();
 }
 
+size_t Heap::arrayBufferSize()
+{
+    return m_arrayBuffers.size();
+}
+
 size_t Heap::extraMemorySize()
 {
     // FIXME: Change this to use SaturatedArithmetic when available.
diff --git a/Source/JavaScriptCore/heap/Heap.h b/Source/JavaScriptCore/heap/Heap.h
index b054e41c27ed3..07f374b4717d2 100644
--- a/Source/JavaScriptCore/heap/Heap.h
+++ b/Source/JavaScriptCore/heap/Heap.h
@@ -435,6 +435,7 @@ class Heap {
     JS_EXPORT_PRIVATE size_t protectedGlobalObjectCount();
     JS_EXPORT_PRIVATE std::unique_ptr<TypeCountSet> protectedObjectTypeCounts();
     JS_EXPORT_PRIVATE std::unique_ptr<TypeCountSet> objectTypeCounts();
+    JS_EXPORT_PRIVATE size_t arrayBufferSize();
 
     HashSet<MarkedVectorBase*>& markListSet();
     void addMarkedJSValueRefArray(MarkedJSValueRefArray*);