diff --git a/docker/prod/backend.Dockerfile b/docker/prod/backend.Dockerfile
index 266e3983..7944bc67 100644
--- a/docker/prod/backend.Dockerfile
+++ b/docker/prod/backend.Dockerfile
@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 # Base image (Debian-based for glibc + OpenSSL compatibility)
 FROM node:20-bookworm-slim AS base
 WORKDIR /app