diff --git a/docker/deploy/backend.Dockerfile b/docker/deploy/backend.Dockerfile
index 9c50dae0..a5dd1aeb 100644
--- a/docker/deploy/backend.Dockerfile
+++ b/docker/deploy/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