diff --git a/src/node_internals.h b/src/node_internals.h
index 70750cc87179ca..0ae17f71ecbcb2 100644
--- a/src/node_internals.h
+++ b/src/node_internals.h
@@ -112,7 +112,7 @@ class NodeArrayBufferAllocator : public ArrayBufferAllocator {
   void* Allocate(size_t size) override;  // Defined in src/node.cc
   void* AllocateUninitialized(size_t size) override;
   void Free(void* data, size_t size) override;
-  virtual void* Reallocate(void* data, size_t old_size, size_t size);
+  void* Reallocate(void* data, size_t old_size, size_t size) override;
   virtual void RegisterPointer(void* data, size_t size) {
     total_mem_usage_.fetch_add(size, std::memory_order_relaxed);
   }