diff --git a/release_files/ui-post-install.sh b/release_files/ui-post-install.sh
index ff6c4ee9b..e2eb32cdc 100644
--- a/release_files/ui-post-install.sh
+++ b/release_files/ui-post-install.sh
@@ -8,6 +8,10 @@ pid="$(pgrep -x -f /usr/bin/netbird-ui || true)"
 if [ -n "${pid}" ]
 then
   uid="$(cat /proc/"${pid}"/loginuid)"
+  # loginuid can be 4294967295 (-1) if not set, fall back to process uid
+  if [ "${uid}" = "4294967295" ] || [ "${uid}" = "-1" ]; then
+    uid="$(stat -c '%u' /proc/"${pid}")"
+  fi
   username="$(id -nu "${uid}")"
   # Only re-run if it was already running
   pkill -x -f /usr/bin/netbird-ui >/dev/null 2>&1