diff --git a/blockdev.c b/blockdev.c
index be88098..0a9dec3 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -589,7 +589,7 @@
     if (eject_device(mon, bs, 0) < 0) {
         return -1;
     }
-    bdrv_flags = bdrv_get_type_hint(bs) == BDRV_TYPE_CDROM ? 0 : BDRV_O_RDWR;
+    bdrv_flags = bdrv_is_read_only(bs) ? 0 : BDRV_O_RDWR;
     if (bdrv_open(bs, filename, bdrv_flags, drv) < 0) {
         qerror_report(QERR_OPEN_FILE_FAILED, filename);
         return -1;