diff --git a/mozilla/netwerk/streamconv/test/Converters.h b/mozilla/netwerk/streamconv/test/Converters.h
index a6e8c399bbc..4fe11c59ffd 100644
--- a/mozilla/netwerk/streamconv/test/Converters.h
+++ b/mozilla/netwerk/streamconv/test/Converters.h
@@ -23,6 +23,7 @@ public:
     NS_DECL_ISUPPORTS
 
     TestConverter();
+    virtual ~TestConverter() {;};
 
     // nsIStreamConverter methods
     NS_IMETHOD Convert(nsIInputStream *aFromStream, const PRUnichar *aFromType,