diff --git a/components/drivers/block/blk_dfs.c b/components/drivers/block/blk_dfs.c
index 96800e15643..adc6a81e466 100644
--- a/components/drivers/block/blk_dfs.c
+++ b/components/drivers/block/blk_dfs.c
@@ -175,14 +175,18 @@ static ssize_t blk_fops_write(struct dfs_file *file, const void *buf, size_t cou
     if ((count - wsize) / bytes_per_sector != 0)
     {
         res = rt_device_write(dev, blk_pos, buf + wsize, (count - wsize) / bytes_per_sector);
-        wsize += res * bytes_per_sector;
-        blk_pos += res;
 
         if (res != (count - wsize) / bytes_per_sector)
         {
+            wsize += res * bytes_per_sector;
             *pos += wsize;
             return wsize;
         }
+        else
+        {
+            wsize += res * bytes_per_sector;
+            blk_pos += res;
+        }
     }
 
     /*