diff --git a/protocols/schemas/scene.prs b/protocols/schemas/scene.prs
index 5375651..320fe1a 100644
--- a/protocols/schemas/scene.prs
+++ b/protocols/schemas/scene.prs
@@ -8,12 +8,7 @@ PortalDestination =
 
 Gravity = <gravity @direction shapes.Vector3> .
 
-AmbientSound = <ambient-sound @name string @spec SoundSpec> .
-
-SoundSpec =
-/ @stream <stream @url string>
-/ @loop <loop @url string>
-.
+AmbientSound = <ambient-sound @name string @spec shapes.SoundSpec> .
 
 ; Message
 Touch = <touch @subject string @object string> .
diff --git a/protocols/schemas/shapes.prs b/protocols/schemas/shapes.prs
index a03f444..6de3322 100644
--- a/protocols/schemas/shapes.prs
+++ b/protocols/schemas/shapes.prs
@@ -34,7 +34,11 @@ Color =
 / @transparent <color @r double @g double @b double @alpha double @shape Shape>
 .
 
-Sound = <sound @spec scene.SoundSpec @shape Shape> .
+Sound = <sound @spec SoundSpec @shape Shape> .
+SoundSpec =
+/ @stream <stream @url string>
+/ @loop <loop @url string>
+.
 
 Name = <name @base string @shape Shape> .
 
diff --git a/src/index.ts b/src/index.ts
index 95a1140..71466ba 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -34,7 +34,7 @@ function interpretScene(myId: string, runningEngine: RunningEngine, rootMesh: Me
 
         during SceneProtocol.AmbientSound({
             "name": $name: string,
-            "spec": $spec: SceneProtocol.SoundSpec
+            "spec": $spec: Shapes.SoundSpec
         }) => spawn named `sound:${name}` {
             const sound = buildSound(name, runningEngine.scene, spec, false);
             on stop sound.dispose();
diff --git a/src/shapes.ts b/src/shapes.ts
index d362229..2bc42fe 100644
--- a/src/shapes.ts
+++ b/src/shapes.ts
@@ -191,7 +191,7 @@ export function buildMesh(
     }
 }
 
-export function buildSound(name: string, scene: Scene, spec: SceneProtocol.SoundSpec, spatial: boolean): Sound {
+export function buildSound(name: string, scene: Scene, spec: Shapes.SoundSpec, spatial: boolean): Sound {
     const options: ISoundOptions = {
         loop: true,
         autoplay: true,