diff --git a/mozilla/xpcom/tests/TestCOMPtr.cpp b/mozilla/xpcom/tests/TestCOMPtr.cpp
index 9d095a68e98..1d520f08f93 100644
--- a/mozilla/xpcom/tests/TestCOMPtr.cpp
+++ b/mozilla/xpcom/tests/TestCOMPtr.cpp
@@ -21,7 +21,7 @@
 #include "nsCOMPtr.h"
 #include "nsISupports.h"
 
-#ifndef NSCAP_NO_NEW_CASTS
+#ifdef HAVE_CPP_NEW_CASTS
   #define STATIC_CAST(T,x)  static_cast<T>(x)
   #define REINTERPRET_CAST(T,x) reinterpret_cast<T>(x)
 #else