-#define sizebuf(b, bs, rs, es, a) _sizebuf((void **)(b), (bs), (rs), (es), (a))
-#define sizebuf2(b, rs, a) _sizebuf((void **)(&(b)), &(b ## size), (rs), sizeof(*(b)), (a))
+#define sizebuf(b, bs, rs, es, a) _sizebuf((void **)(void *)(b), (bs), (rs), (es), (a))
+#define sizebuf2(b, rs, a) _sizebuf((void **)(void *)(&(b)), &(b ## size), (rs), sizeof(*(b)), (a))