/* XXX does anyone even use this? */
PERLVARI(Gdo_undump, bool, FALSE) /* -u or dump seen? */
-#if defined(MYMALLOC) && defined(USE_THREADS)
+#if defined(MYMALLOC) && (defined(USE_THREADS) || defined(USE_ITHREADS))
PERLVAR(Gmalloc_mutex, perl_mutex) /* Mutex for malloc */
#endif