diff --git a/ReactCommon/react/renderer/core/ShadowNodeFamily.h b/ReactCommon/react/renderer/core/ShadowNodeFamily.h
index ad3ecf0e36d..2f57666c179 100644
--- a/ReactCommon/react/renderer/core/ShadowNodeFamily.h
+++ b/ReactCommon/react/renderer/core/ShadowNodeFamily.h
@@ -26,7 +26,7 @@ class State;
  * Represents all things that shadow nodes from the same family have in common.
  * To be used inside `ShadowNode` class *only*.
  */
-class ShadowNodeFamily {
+class ShadowNodeFamily final {
  public:
   using Shared = std::shared_ptr<ShadowNodeFamily const>;
   using Weak = std::weak_ptr<ShadowNodeFamily const>;