diff --git a/photon/libc/sys/magenta/fio.c b/photon/libc/sys/magenta/fio.c
index d66df45..ca76276 100644
--- a/photon/libc/sys/magenta/fio.c
+++ b/photon/libc/sys/magenta/fio.c
@@ -102,7 +102,7 @@ unsigned int __fio_read(struct __io_file *f, char *buf, unsigned int sz)
         return real_sz;
     }
 
-    mx_status_t err = mx_read(f->handle, sz, buf + i, &real_sz);
+    mx_status_t err = mx_object_read(f->handle, sz, buf + i, &real_sz);
 
     if (err != MX_OK || real_sz != sz) {
         f->err = 1;
@@ -140,7 +140,7 @@ int __fio_ungetc(struct __io_file *f, char c)
 unsigned int __fio_flush(struct __io_file *f)
 {
     unsigned long written = 0;
-    mx_status_t ret = mx_write(f->handle, f->buf_idx, f->buf, &written);
+    mx_status_t ret = mx_object_write(f->handle, f->buf_idx, f->buf, &written);
     if (ret != MX_OK || written != f->buf_idx) {
         f->err = 1;
     }