diff --git a/docker/natter/Dockerfile b/docker/natter/Dockerfile
index d9a9fb8..01a8048 100644
--- a/docker/natter/Dockerfile
+++ b/docker/natter/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 ARG ALPINE_VERSION="3.20"
 
 FROM rustlang/rust:nightly-alpine$ALPINE_VERSION AS builder
diff --git a/docker/natter_development/Dockerfile b/docker/natter_development/Dockerfile
index 66f9bc2..ffcb9b3 100644
--- a/docker/natter_development/Dockerfile
+++ b/docker/natter_development/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 ARG ALPINE_VERSION="3.20"
 
 FROM rustlang/rust:nightly-alpine$ALPINE_VERSION AS builder