diff --git a/storage/test/test_AsXXX_helpers.cpp b/storage/test/test_AsXXX_helpers.cpp
index 22c06f899cc1..a46ddbb65199 100644
--- a/storage/test/test_AsXXX_helpers.cpp
+++ b/storage/test/test_AsXXX_helpers.cpp
@@ -20,6 +20,8 @@ public:
   NS_DECL_ISUPPORTS
   NS_DECL_ASYNCSTATEMENTSPINNER
   Spinner() {}
+protected:
+  virtual ~Spinner() {}
 };
 
 NS_IMPL_ISUPPORTS_INHERITED0(Spinner,