diff --git a/stdlib/europa/dagger/engine/plan.cue b/stdlib/europa/dagger/engine/plan.cue
index 187d71cf..2d444b33 100644
--- a/stdlib/europa/dagger/engine/plan.cue
+++ b/stdlib/europa/dagger/engine/plan.cue
@@ -28,7 +28,7 @@ package engine
 	proxy: [endpoint=string]: _#proxyEndpoint
 
 	// Configure platform execution
-	platform?: #Platform
+	platform?: string
 
 	// Execute actions in containers
 	actions: {
@@ -142,7 +142,3 @@ _#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"
diff --git a/tests/plan/outputs/outputs.cue b/tests/plan/outputs/outputs.cue
index 086b6239..30101e8f 100644
--- a/tests/plan/outputs/outputs.cue
+++ b/tests/plan/outputs/outputs.cue
@@ -7,10 +7,10 @@ engine.#Plan & {
 		scratch: engine.#Scratch
 
 		data: engine.#WriteFile & {
-			input:    scratch.output
-			path:     "/test"
-			mode:     0o600
-			contents: "foobar"
+			input:       scratch.output
+			path:        "/test"
+			permissions: 0o600
+			contents:    "foobar"
 		}
 	}