diff --git a/stdlib/europa/dagger/engine/plan.cue b/stdlib/europa/dagger/engine/plan.cue
index 99f242e3..187d71cf 100644
--- a/stdlib/europa/dagger/engine/plan.cue
+++ b/stdlib/europa/dagger/engine/plan.cue
@@ -27,6 +27,9 @@ package engine
 	// Forward network services to and from the client
 	proxy: [endpoint=string]: _#proxyEndpoint
 
+	// Configure platform execution
+	platform?: #Platform
+
 	// Execute actions in containers
 	actions: {
 		...
@@ -139,3 +142,7 @@ _#proxyEndpoint: {
 
 // A network service address
 #Address: string & =~"^(tcp://|unix://|udp://).*"
+
+// Platform supported by buildkit daemon
+#Platform: "linux/amd64" | "linux/arm64" | "linux/arm/v7" | "linux/arm/v6" |
+	"linux/s390x" | "linux/ppc64le" | "darwin/amd64" | "windows/amd64"