diff --git a/Dockerfile b/Dockerfile
index 53ce3ab..2f9f64f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,11 @@
 FROM python:3.11-slim
 
+# Backwards compatible defaults
+ENV USER=root
+ENV GROUPNAME=root
+ENV UID=0
+ENV GID=0
+
 SHELL ["/bin/bash", "-ec"]
 
 RUN apt update && apt install --no-install-recommends -y bluez build-essential
@@ -9,4 +15,6 @@ RUN python3 -m venv /opt/venv && \
 	pip install --upgrade --extra-index-url=https://www.piwheels.org/simple pip TheengsGateway==1.5.0
 
 COPY chroot /
-CMD source /opt/venv/bin/activate && exec /opt/venv/start.sh
+CMD (getent group "${GROUPNAME}" || groupadd -g "${GID}" "${GROUPNAME}") && \
+    (getent passwd "${USER}" || useradd -u "${UID}" -g "${GID}" -m "${USER}") && \
+    su -l -s "/bin/bash" -c "source /opt/venv/bin/activate && exec /opt/venv/start.sh" "${USER}"