diff --git a/ci/L0_backend_vllm/test.sh b/ci/L0_backend_vllm/test.sh
index b605e49..741dc68 100755
--- a/ci/L0_backend_vllm/test.sh
+++ b/ci/L0_backend_vllm/test.sh
@@ -27,7 +27,7 @@
 
 RET=0
 SUBTESTS="accuracy_test request_cancellation enabled_stream vllm_backend metrics_test"
-VLLM_WORKER_MULTIPROC_METHOD=spawn
+export VLLM_WORKER_MULTIPROC_METHOD=spawn
 
 python3 -m pip install tritonclient[grpc]