diff --git a/build/start-container.sh b/build/start-container.sh
index 38c8251..e1fa2e3 100644
--- a/build/start-container.sh
+++ b/build/start-container.sh
@@ -4,7 +4,7 @@
 set -e
 
 # install extra packages and extensions on first boot
-if [[ ! -f /etc/first_boot ]]; then
+if [[ $(id -u) -eq 0 && ! -f /etc/first_boot ]]; then
     if [[ -n "${EXTRA_APK_PACKAGES// /}" ]]; then
         # shellcheck disable=SC2086
         apk add --no-cache $EXTRA_APK_PACKAGES