diff --git a/drivers/mtd/tests/mtd_readtest.c b/drivers/mtd/tests/mtd_readtest.c
index 79fc453..9edd658 100644
--- a/drivers/mtd/tests/mtd_readtest.c
+++ b/drivers/mtd/tests/mtd_readtest.c
@@ -130,7 +130,7 @@ static int is_block_bad(int ebnum)
        loff_t addr = ebnum * mtd->erasesize;
        int ret;

-       ret = mtd->block_isbad(mtd, addr);
+       ret = mtd->block_isbad ? mtd->block_isbad(mtd, addr) : 0;
        if (ret)
                printk(PRINT_PREF "block %d is bad\n", ebnum);
        return ret;