diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index cd361320816dc7..e2ed994bb3e352 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -99,7 +99,7 @@ class CallbackInfo {
                                   Local<ArrayBuffer> object,
                                   FreeCallback callback,
                                   char* data,
-                                  void* hint = 0);
+                                  void* hint = nullptr);
  private:
   static void WeakCallback(const WeakCallbackInfo<CallbackInfo>&);
   inline void WeakCallback(Isolate* isolate);