diff --git a/components/drivers/sdio/block_dev.c b/components/drivers/sdio/block_dev.c
index 70159af30c..59eb56cdcd 100644
--- a/components/drivers/sdio/block_dev.c
+++ b/components/drivers/sdio/block_dev.c
@@ -303,7 +303,7 @@ static rt_size_t rt_mmcsd_read(rt_device_t dev,
     while (remain_size)
     {
         req_size = (remain_size > blk_dev->max_req_size) ? blk_dev->max_req_size : remain_size;
-        err = rt_mmcsd_req_blk(blk_dev->card, pos + offset, rd_ptr, req_size, 0);
+        err = rt_mmcsd_req_blk(blk_dev->card, part->offset + pos + offset, rd_ptr, req_size, 0);
         if (err)
             break;
         offset += req_size;
@@ -344,7 +344,7 @@ static rt_size_t rt_mmcsd_write(rt_device_t dev,
     while (remain_size)
     {
         req_size = (remain_size > blk_dev->max_req_size) ? blk_dev->max_req_size : remain_size;
-        err = rt_mmcsd_req_blk(blk_dev->card, pos + offset, wr_ptr, req_size, 1);
+        err = rt_mmcsd_req_blk(blk_dev->card, part->offset + pos + offset, wr_ptr, req_size, 1);
         if (err)
             break;
         offset += req_size;