diff --git a/ci/run_envoy_docker.sh b/ci/run_envoy_docker.sh
index d52172671f73..3fd04a01e283 100755
--- a/ci/run_envoy_docker.sh
+++ b/ci/run_envoy_docker.sh
@@ -18,7 +18,7 @@ USER_GROUP=root
 
 mkdir -p "${ENVOY_DOCKER_BUILD_DIR}"
 # Since we specify an explicit hash, docker-run will pull from the remote repo if missing.
-docker run --rm -t -i -e http_proxy=${http_proxy} -e https_proxy=${https_proxy} \
+docker run --rm -t -i -e HTTP_PROXY=${http_proxy} -e HTTPS_PROXY=${https_proxy} \
   -u "${USER}":"${USER_GROUP}" -v "${ENVOY_DOCKER_BUILD_DIR}":/build \
   -v "$PWD":/source -e NUM_CPUS --cap-add SYS_PTRACE "${IMAGE_NAME}":"${IMAGE_ID}" \
   /bin/bash -lc "groupadd --gid $(id -g) -f envoygroup && useradd -o --uid $(id -u) --gid $(id -g) \