diff --git a/runs/frontier-fidelity-envelope-v1/run_q235_after_q30.sh b/runs/frontier-fidelity-envelope-v1/run_q235_after_q30.sh
index f96b5b8..944813b 100644
--- a/runs/frontier-fidelity-envelope-v1/run_q235_after_q30.sh
+++ b/runs/frontier-fidelity-envelope-v1/run_q235_after_q30.sh
@@ -14,6 +14,7 @@ VENV_ROOT="${VENV_ROOT:-/tmp/wjh/venvs/vllm-0.20.0-cu129-profiler-v1}"
 # autotunes a previously unseen FP8 grouped-GEMM shape.
 export PATH="/usr/local/cuda/bin:${PATH}"
 export FRONTIER_VLLM_MODEL_TYPE=qwen3_moe
+export VLLM_KV_CACHE_LAYOUT=NHD
 command -v nvcc >/dev/null
 
 mkdir -p "${OUTPUT_ROOT}/supervisor" "${PROFILE_ROOT}"