diff --git a/xpcom/tests/windows/TestCOM.cpp b/xpcom/tests/windows/TestCOM.cpp
index ed694888d7f..b3a0b545f00 100644
--- a/xpcom/tests/windows/TestCOM.cpp
+++ b/xpcom/tests/windows/TestCOM.cpp
@@ -70,6 +70,7 @@ MozExternalRefCountType nsTestCom::Release()
 }
 
 class nsTestComFactory MOZ_FINAL : public nsIFactory {
+  ~nsTestComFactory() {}
   NS_DECL_ISUPPORTS
 public:
   nsTestComFactory() {