[`@defl`](./defl.md) will not let you change the value of a label once it is
defined. They are immutable.
Though there may be some circumstances you may want to do this. You can use
`@redefl` to achieve this.
```
@defl ADDR, $4000
@defl ADDR, $2000 ; Will result in an ERROR!
@echo "Success!"
```
```
@defl ADDR, $4000
@redefl ADDR, $2000
@echo "Success!"
```