op == DFU_OP_READ ? "load" : "write",
                        dfu->data.mmc.dev, dfu->data.mmc.part,
                        (unsigned int) buf, dfu->name);
-               if (op == DFU_OP_WRITE)
-                       sprintf(cmd_buf + strlen(cmd_buf), " %lx", *len);
                break;
        case DFU_FS_EXT4:
                sprintf(cmd_buf, "ext4%s mmc %d:%d 0x%x /%s",
                        op == DFU_OP_READ ? "load" : "write",
                        dfu->data.mmc.dev, dfu->data.mmc.part,
                        (unsigned int) buf, dfu->name);
-               if (op == DFU_OP_WRITE)
-                       sprintf(cmd_buf + strlen(cmd_buf), " %ld", *len);
                break;
        default:
                printf("%s: Layout (%s) not (yet) supported!\n", __func__,
                return -1;
        }
 
+       if (op == DFU_OP_WRITE)
+               sprintf(cmd_buf + strlen(cmd_buf), " %lx", *len);
+
        debug("%s: %s 0x%p\n", __func__, cmd_buf, cmd_buf);
 
        ret = run_command(cmd_buf, 0);