diff --git a/monitor.c b/monitor.c
index 0448a70..196c7a6 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1099,6 +1099,7 @@ static int do_change_block(Monitor *mon, const char *device,
         return -1;
     }
     if (bdrv_open2(bs, filename, BDRV_O_RDWR, drv) < 0) {
+        qerror_report(QERR_OPEN_FILE_FAILED, filename);
         return -1;
     }
     return monitor_read_bdrv_key_start(mon, bs, NULL, NULL);