1 files changed, 3 insertions, 3 deletions
diff --git a/fxjs/cjs_runtime.h b/fxjs/cjs_runtime.h
index 73b722db43..f7b2679523 100644
--- a/fxjs/cjs_runtime.h
+++ b/fxjs/cjs_runtime.h
@@ -21,9 +21,9 @@
 
 class CJS_EventContext;
 
-class CJS_Runtime : public IJS_Runtime,
-                    public CFXJS_Engine,
-                    public Observable<CJS_Runtime> {
+class CJS_Runtime final : public IJS_Runtime,
+                          public CFXJS_Engine,
+                          public Observable<CJS_Runtime> {
  public:
   using FieldEvent = std::pair<WideString, JS_EVENT_T>;