diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index c04be68d1b0cbe..f091ac96209721 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -1213,6 +1213,10 @@ void Initialize(Local<Object> target,
     // TODO(thangktran): drop this check when V8 is pumped to 8.0 .
     if (!array_buffer->IsExternal())
       array_buffer->Externalize(array_buffer->GetBackingStore());
+    array_buffer->SetPrivate(
+        env->context(),
+        env->arraybuffer_untransferable_private_symbol(),
+        True(env->isolate())).Check();
     CHECK(target
               ->Set(env->context(),
                     FIXED_ONE_BYTE_STRING(env->isolate(), "zeroFill"),
diff --git a/src/node_http2.cc b/src/node_http2.cc
index 1110288f6f9a9d..a4d1df0ca9fdfb 100644
--- a/src/node_http2.cc
+++ b/src/node_http2.cc
@@ -578,6 +578,9 @@ Http2Session::Http2Session(Environment* env,
     // TODO(thangktran): drop this check when V8 is pumped to 8.0 .
     if (!ab->IsExternal())
       ab->Externalize(ab->GetBackingStore());
+    ab->SetPrivate(env->context(),
+                   env->arraybuffer_untransferable_private_symbol(),
+                   True(env->isolate())).Check();
     js_fields_ab_.Reset(env->isolate(), ab);
     Local<Uint8Array> uint8_arr =
         Uint8Array::New(ab, 0, kSessionUint8FieldCount);