diff --git a/base-notebook/start-singleuser.sh b/base-notebook/start-singleuser.sh
index 62ad9d1d..d8549042 100755
--- a/base-notebook/start-singleuser.sh
+++ b/base-notebook/start-singleuser.sh
@@ -9,33 +9,5 @@ if [[ "${NOTEBOOK_ARGS} $*" != *"--ip="* ]]; then
     NOTEBOOK_ARGS="--ip=0.0.0.0 ${NOTEBOOK_ARGS}"
 fi
 
-# handle some deprecated environment variables
-# from DockerSpawner < 0.8.
-# These won't be passed from DockerSpawner 0.9,
-# so avoid specifying --arg=empty-string
-if [ -n "${NOTEBOOK_DIR}" ]; then
-    # shellcheck disable=SC2089
-    NOTEBOOK_ARGS="--notebook-dir='${NOTEBOOK_DIR}' ${NOTEBOOK_ARGS}"
-fi
-if [ -n "${JPY_PORT}" ]; then
-    NOTEBOOK_ARGS="--port=${JPY_PORT} ${NOTEBOOK_ARGS}"
-fi
-if [ -n "${JPY_USER}" ]; then
-    NOTEBOOK_ARGS="--user=${JPY_USER} ${NOTEBOOK_ARGS}"
-fi
-if [ -n "${JPY_COOKIE_NAME}" ]; then
-    NOTEBOOK_ARGS="--cookie-name=${JPY_COOKIE_NAME} ${NOTEBOOK_ARGS}"
-fi
-if [ -n "${JPY_BASE_URL}" ]; then
-    NOTEBOOK_ARGS="--base-url=${JPY_BASE_URL} ${NOTEBOOK_ARGS}"
-fi
-if [ -n "${JPY_HUB_PREFIX}" ]; then
-    NOTEBOOK_ARGS="--hub-prefix=${JPY_HUB_PREFIX} ${NOTEBOOK_ARGS}"
-fi
-if [ -n "${JPY_HUB_API_URL}" ]; then
-    NOTEBOOK_ARGS="--hub-api-url=${JPY_HUB_API_URL} ${NOTEBOOK_ARGS}"
-fi
-NOTEBOOK_BIN="jupyterhub-singleuser"
-
-# shellcheck disable=SC1091,SC2086,SC2090
-. /usr/local/bin/start.sh "${NOTEBOOK_BIN}" ${NOTEBOOK_ARGS} "$@"
+# shellcheck disable=SC1091,SC2086
+. /usr/local/bin/start.sh jupyterhub-singleuser $NOTEBOOK_ARGS "$@"