1 files changed, 1 insertions, 1 deletions
diff --git a/core/fxcrt/observable_unittest.cpp b/core/fxcrt/observable_unittest.cpp
index 63e61b8513..5c55805afb 100644
--- a/core/fxcrt/observable_unittest.cpp
+++ b/core/fxcrt/observable_unittest.cpp
@@ -12,7 +12,7 @@
 namespace fxcrt {
 namespace {
 
-class PseudoObservable : public Observable<PseudoObservable> {
+class PseudoObservable final : public Observable<PseudoObservable> {
  public:
   PseudoObservable() {}
   int SomeMethod() { return 42; }