diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 483173f..abd1e46 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -4,6 +4,6 @@ set -e
 
 # Update nginx user id
 deluser nginx
-adduser -u $PUID -D nginx
+adduser -u "$PUID" -D nginx
 
 exec nginx -g "daemon off;"