diff --git a/docs/contributing_sw/debugging_failed_builds.md b/docs/contributing_sw/debugging_failed_builds.md
index c2647e242..2dbccb328 100644
--- a/docs/contributing_sw/debugging_failed_builds.md
+++ b/docs/contributing_sw/debugging_failed_builds.md
@@ -85,7 +85,6 @@ source ${EESSI_CVMFS_REPO}/versions/${EESSI_PILOT_VERSION}/init/minimal_eessi_en
 ```
 Then, run the `startprefix` command to actually start the Gentoo Prefix environment:
 ```
-export EESSI_CPU_FAMILY=aarch64
 ${EESSI_CVMFS_REPO}/versions/${EESSI_PILOT_VERSION}/compat/${EESSI_OS_TYPE}/${EESSI_CPU_FAMILY}/startprefix
 ```