diff --git a/roles/autofs/files/usercache.sh b/roles/autofs/files/usercache.sh
index b413f45..1f0e9c5 100644
--- a/roles/autofs/files/usercache.sh
+++ b/roles/autofs/files/usercache.sh
@@ -1,7 +1,8 @@
-if [ $UID -gt 999 ] && [ "`/usr/bin/id -gn`" = "`/usr/bin/id -un`" ]; then
+# shellcheck shell=sh
+if [ "$(id -u)" -gt 999 ] && [ "$(id -gn)" = "$(id -un)" ]; then
     if [ -z "$XDG_RUNTIME_DIR" ]; then
-        if [ -d "/run/user/${UID}" ]; then
-            XDG_RUNTIME_DIR="/run/user/${UID}"
+        if [ -d "/run/user/$(id -u)" ]; then
+		XDG_RUNTIME_DIR="/run/user/$(id -u)"
         else
             XDG_RUNTIME_DIR="$HOME"
         fi