diff --git a/Tests/CMakeLib/testCMExtMemory.cxx b/Tests/CMakeLib/testCMExtMemory.cxx
index 6663c17d8d..2aeaf7f84c 100644
--- a/Tests/CMakeLib/testCMExtMemory.cxx
+++ b/Tests/CMakeLib/testCMExtMemory.cxx
@@ -13,7 +13,7 @@ public:
 class Derived : public Base
 {
 public:
-  ~Derived() = default;
+  ~Derived() override = default;
 
   void method() {}
 };