diff --git a/v3/test/docker/Dockerfile.linux-arm64 b/v3/test/docker/Dockerfile.linux-arm64
index fb6e4054b..f4fe2d237 100644
--- a/v3/test/docker/Dockerfile.linux-arm64
+++ b/v3/test/docker/Dockerfile.linux-arm64
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 # Build Linux binaries for Wails v3 examples using Ubuntu 24.04 (ARM64 native)
 FROM ubuntu:24.04
 
diff --git a/v3/test/docker/Dockerfile.linux-x86_64 b/v3/test/docker/Dockerfile.linux-x86_64
index b3a1dcf80..22e7ff586 100644
--- a/v3/test/docker/Dockerfile.linux-x86_64
+++ b/v3/test/docker/Dockerfile.linux-x86_64
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1
 # Build Linux binaries for Wails v3 examples using Ubuntu 24.04 (x86_64 native)
 FROM --platform=linux/amd64 ubuntu:24.04