diff --git a/include/v8.h b/include/v8.h
index 11fccdf023..311ad434de 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2425,10 +2425,20 @@ class V8EXPORT ArrayBuffer : public Object {
     }
 
     /**
-     * Free the memory pointed to |data|. That memory is guaranteed to be
-     * previously allocated by |Allocate|.
+     * Free the memory block of size |length|, pointed to by |data|.
+     * That memory is guaranteed to be previously allocated by |Allocate|.
      */
-    virtual void Free(void* data) = 0;
+    virtual void Free(void* data, size_t length) {
+      // Override with call to |Free(void*)| for compatibility
+      // with legacy version.
+      Free(data);
+    }
+
+    /**
+     * Deprecated. Never called directly by V8.
+     * For compatibility with legacy version of this interface.
+     */
+    virtual void Free(void* data);
   };
 
   /**
diff --git a/src/api.cc b/src/api.cc
index 1ae81b1325..d442126ebb 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3071,6 +3071,12 @@ void v8::ArrayBuffer::CheckCast(Value* that) {
 }
 
 
+void v8::ArrayBuffer::Allocator::Free(void* data) {
+  API_Fatal("v8::ArrayBuffer::Allocator::Free",
+            "Override Allocator::Free(void*, size_t)");
+}
+
+
 void v8::ArrayBufferView::CheckCast(Value* that) {
   i::Handle<i::Object> obj = Utils::OpenHandle(that);
   ApiCheck(obj->IsJSArrayBufferView(),
diff --git a/src/d8.cc b/src/d8.cc
index e66a2ece60..0f4b5e17ad 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -1635,7 +1635,9 @@ class ShellArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   virtual void* AllocateUninitialized(size_t length) {
     return malloc(length);
   }
-  virtual void Free(void* data) { free(data); }
+  virtual void Free(void* data, size_t) { free(data); }
+  // TODO(dslomov): Remove when v8:2823 is fixed.
+  virtual void Free(void* data) { UNREACHABLE(); }
 };
 
 
diff --git a/src/runtime.cc b/src/runtime.cc
index df31e70d5c..9775147042 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -689,7 +689,9 @@ void Runtime::FreeArrayBuffer(Isolate* isolate,
   isolate->heap()->AdjustAmountOfExternalAllocatedMemory(
       -static_cast<intptr_t>(allocated_length));
   CHECK(V8::ArrayBufferAllocator() != NULL);
-  V8::ArrayBufferAllocator()->Free(phantom_array_buffer->backing_store());
+  V8::ArrayBufferAllocator()->Free(
+      phantom_array_buffer->backing_store(),
+      allocated_length);
 }
 
 
diff --git a/test/cctest/cctest.cc b/test/cctest/cctest.cc
index 94dcce1305..a2caf0f3ba 100644
--- a/test/cctest/cctest.cc
+++ b/test/cctest/cctest.cc
@@ -99,9 +99,10 @@ v8::Isolate* CcTest::default_isolate_;
 
 
 class CcTestArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
- public:
   virtual void* Allocate(size_t length) { return malloc(length); }
-  virtual void Free(void* data) { free(data); }
+  virtual void Free(void* data, size_t length) { free(data); }
+  // TODO(dslomov): Remove when v8:2823 is fixed.
+  virtual void Free(void* data) { UNREACHABLE(); }
 };