diff --git a/ci/stack_env.sh b/ci/stack_env.sh
index fb6d028c5cb0273523cdb867b80b93a7731933cb..6bf7bacbda9cbd2f50b04a5fddada7171506baaa 100644
--- a/ci/stack_env.sh
+++ b/ci/stack_env.sh
@@ -25,6 +25,8 @@ if [ "$accelerator" != "none" ]
 then
     export acc_type=$(echo $env_json | jq -Mrc '.accelerator.type')
     export acc_arch=$(echo $env_json | jq -Mrc '.accelerator.arch')
+else
+    export acc_arch="none"
 fi
 
 echo "STACK_CONFIG_PATH: ${STACK_CONFIG_PATH}"