# \#sysconf

**URL:** https://erlangforums.com/tag/sysconf/978.md

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## [Reading sys.conf fails when built for prod](https://erlangforums.com/t/reading-sys-conf-fails-when-built-for-prod/5557)

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**Author:** [@Paddlaren](https://erlangforums.com/u/Paddlaren)\
**Replies:** 2\
**Last updated:** [April 18, 2026, 5:02pm UTC](https://erlangforums.com/t/reading-sys-conf-fails-when-built-for-prod/5557 "2026-04-18T17:02:55Z")

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Hi, I have a project where I read the configuration file in the xxx\_app:start() function. This is illustrated in a test project at GitLab that is a clean rebar3 umbrella project with the config and a single io:format …