diff --git a/docker/scripts/start-slim.sh b/docker/scripts/start-slim.sh
index 3ffbc24b3..aaa5e912a 100755
--- a/docker/scripts/start-slim.sh
+++ b/docker/scripts/start-slim.sh
@@ -6,26 +6,45 @@ SITESPEEDIO=/usr/src/app/bin/sitespeed.js
 
 MAX_OLD_SPACE_SIZE="${MAX_OLD_SPACE_SIZE:-2048}"
 
-WORKDIR_UID=$(stat -c "%u" .)
-WORKDIR_GID=$(stat -c "%g" .)
+# write files owned by the user who runs the container
+# if your volume is mounted at /sitespeed.io, use it as CWD
+[[ -d /sitespeed.io && "$PWD" = "/" ]] && cd /sitespeed.io
 
-# Create user with the same UID and GID as the owner of the working directory, which will be used
-# to execute node. This is partly for security and partly so output files won't be owned by root.
-groupadd --non-unique --gid $WORKDIR_GID sitespeedio
-useradd --non-unique --uid $WORKDIR_UID --gid $WORKDIR_GID --home-dir /tmp sitespeedio
+uid=$(stat -c '%u' . 2>/dev/null || echo 0)
+gid=$(stat -c '%g' . 2>/dev/null || echo 0)
+
+if [[ "$uid" -ne 0 && "$gid" -ne 0 ]]; then
+  if ! getent group "$gid" >/dev/null 2>&1; then
+    groupadd -g "$gid" sitespeedio-host 2>/dev/null || true
+  fi
+  if ! getent passwd "$uid" >/dev/null 2>&1; then
+    useradd -u "$uid" -g "$gid" -M -d /tmp -s /bin/bash sitespeedio-host 2>/dev/null || true
+  fi
+fi
+
+run_as_host() {
+  if [[ "$uid" -ne 0 && "$gid" -ne 0 ]]; then
+    HOME=/tmp chroot --skip-chdir --userspec="+${uid}:+${gid}" / "$@"
+  else
+    HOME=/tmp "$@"
+  fi
+}
+
+function execNode(){
+  run_as_host node "$@"
+}
 
 # Need to explictly override the HOME directory to prevent dconf errors like:
 # (firefox:2003): dconf-CRITICAL **: 00:31:23.379: unable to create directory '/root/.cache/dconf': Permission denied.  dconf will not work properly.
 export HOME=/tmp
 
-
 # Inspired by docker-selenium way of shutting down
 function shutdown {
   kill -s SIGTERM ${PID}
   wait $PID
 }
 
-chroot --skip-chdir --userspec='sitespeedio:sitespeedio' / node --max-old-space-size=$MAX_OLD_SPACE_SIZE $SITESPEEDIO "$@" &
+execNode --max-old-space-size=$MAX_OLD_SPACE_SIZE $SITESPEEDIO "$@" &
 
 PID=$!