diff --git a/packages/entity/traits/spawner.trait.js b/packages/entity/traits/spawner.trait.js
index 47e5a77..b682952 100644
--- a/packages/entity/traits/spawner.trait.js
+++ b/packages/entity/traits/spawner.trait.js
@@ -14,8 +14,6 @@ const decorate = compose(
 export default class Spawner extends decorate(Trait) {
 
   static behaviorTypes() {
-    const spawnKeys = (entity) => Object.keys(entity.traitInstance('spawner').params.spawns)
-      .reduce((r, key) => ({...r, [key]: key}), {})
     return {
       killAllChildren: {
         type: 'void',
@@ -28,7 +26,7 @@ export default class Spawner extends decorate(Trait) {
         args: [
           ['key', {
             type: 'string',
-            options: spawnKeys,
+            options: (entity) => this.optionsForSpawn(entity),
           }],
           ['json', {
             type: 'object',
@@ -42,7 +40,7 @@ export default class Spawner extends decorate(Trait) {
         args: [
           ['key', {
             type: 'string',
-            options: spawnKeys,
+            options: (entity) => this.optionsForSpawn(entity),
           }],
           ['position', {
             type: 'vector',
@@ -113,6 +111,11 @@ export default class Spawner extends decorate(Trait) {
     };
   }
 
+  static optionsForSpawn(entity) {
+    return Object.keys(entity.traitInstance('spawner').params.spawns)
+      .reduce((r, key) => ({...r, [key]: key}), {});
+  }
+
   static type() {
     return 'spawner';
   }
diff --git a/packages/sound/traits/audible.trait.js b/packages/sound/traits/audible.trait.js
index 87772a9..b9faf93 100644
--- a/packages/sound/traits/audible.trait.js
+++ b/packages/sound/traits/audible.trait.js
@@ -21,6 +21,7 @@ export default class Audible extends Trait {
         args: [
           ['key', {
             type: 'string',
+            options: (entity) => this.optionsForSounds(entity),
           }],
         ],
       },
@@ -101,4 +102,9 @@ export default class Audible extends Trait {
     };
   }
 
+  static optionsForSounds(entity) {
+    return Object.keys(entity.traitInstance('audible').params.sounds)
+      .reduce((r, key) => ({...r, [key]: key}), {});
+  }
+
 }