diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index 6b5958b35e7049..580d6a4f4d55bc 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -5421,7 +5421,7 @@ void PBKDF2Request::Work(uv_work_t* work_req) {
 
 void PBKDF2Request::After(Local<Value> (*argv)[2]) {
   if (success_) {
-    (*argv)[0] = Undefined(env()->isolate());
+    (*argv)[0] = Null(env()->isolate());
     (*argv)[1] = Buffer::New(env(), key_, keylen_).ToLocalChecked();
     key_ = nullptr;
     keylen_ = 0;