diff --git a/.github/workflows/build-yocto.yml b/.github/workflows/build-yocto.yml
index 4f330c26..eaa99d3c 100644
--- a/.github/workflows/build-yocto.yml
+++ b/.github/workflows/build-yocto.yml
@@ -63,10 +63,9 @@ jobs:
 
       - name: Kas build
         run: |
-          export DL_DIR=/srv/gh-runners/quic-yocto/downloads
-          export SSTATE_DIR=/srv/gh-runners/quic-yocto/sstate-cache
-          mkdir -p $DL_DIR
-          mkdir -p $SSTATE_DIR
-          mkdir build
-          cd build
-          kas build ../ci/mirror.yml:../ci/${{ matrix.machine }}.yml
+          export CACHE_DIR=/srv/gh-runners/quic-yocto
+          export DL_DIR=${CACHE_DIR}/downloads
+          export SSTATE_DIR=${CACHE_DIR}/sstate-cache
+          export KAS_WORK_DIR=$PWD/../kas
+          mkdir $KAS_WORK_DIR
+          kas build ci/mirror.yml:ci/${{ matrix.machine }}.yml