# Disable package extension
**URL:** https://discourse.julialang.org/t/disable-package-extension/123779
**Category:** General Usage
**Tags:** package, pkg, modelingtoolkit, infiniteopt
**Created:** [December 12, 2024, 6:26pm UTC](https://discourse.julialang.org/t/disable-package-extension/123779 "2024-12-12T18:26:38Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@afossa](https://discourse.julialang.org/u/afossa)
#### Post date: [December 12, 2024, 6:26pm UTC](https://discourse.julialang.org/t/disable-package-extension/123779/1 "2024-12-12T18:26:38Z")
Hello,
Is it possible to “disable” an extension of a package, marked with `[extension]` in the package `Project.toml`?
My use case is the following:
I have an environment with `ModelingToolkit` as dependency, and I want to add `InfiniteOpt#master` to use some of the new (unreleased) features of `InfiniteOpt`.
However, this raises an error during precompilation since `MTKInfiniteOptExt`, an extension of `ModelingToolkit` to ineract with `InfiniteOpt`, does not work with the `master` version of `InfiniteOpt`. I am not interested in using this extension, so this is why for now I will be happy if it was possible to just “disable” it.
For reference, the error I get is:
```julia
ERROR: LoadError: UndefVarError: `AbstractInfOptExpr` not defined in `InfiniteOpt`
```
Thanks!
---
### Author:  [@goerz](https://discourse.julialang.org/u/goerz)
#### Post date: [December 12, 2024, 6:40pm UTC](https://discourse.julialang.org/t/disable-package-extension/123779/2 "2024-12-12T18:40:59Z")
You will have to clone the package, modify its `Project.toml`, and install it with `Pkg.develop`
---
### Author:  [@afossa](https://discourse.julialang.org/u/afossa)
#### Post date: [December 12, 2024, 8:07pm UTC](https://discourse.julialang.org/t/disable-package-extension/123779/3 "2024-12-12T20:07:30Z")
Okay that’s what I’ve also thought. Thanks