diff --git a/.gitea/workflows/nightly.yml b/.gitea/workflows/nightly.yml
index 8e6361b..f7d2df7 100644
--- a/.gitea/workflows/nightly.yml
+++ b/.gitea/workflows/nightly.yml
@@ -50,5 +50,6 @@ jobs:
           AUTOPKG_REPLACE: ${{ github.event.inputs.replace }}
           ONLY: ${{ github.event.inputs.only }}
         run: |
-          sudo -E -u builder \
+          # -E keeps AUTOPKG_*; force HOME to builder's so cargo/git/etc. can write their caches
+          sudo -E -u builder env HOME=/home/builder \
             python3 autopackage.py --keep-going ${ONLY:+--only $ONLY}