diff --git a/src/runtime-three/runtime-host.ts b/src/runtime-three/runtime-host.ts
index 8ff92cbe..7576b5cf 100644
--- a/src/runtime-three/runtime-host.ts
+++ b/src/runtime-three/runtime-host.ts
@@ -61,6 +61,8 @@ export class RuntimeHost {
   private readonly localLightObjects = new Map<string, Group>();
   private readonly modelRenderObjects = new Map<string, Group>();
   private readonly materialTextureCache = new Map<string, CachedMaterialTexture>();
+  private readonly animationMixers = new Map<string, THREE.AnimationMixer>();
+  private readonly instanceAnimationClips = new Map<string, THREE.AnimationClip[]>();
   private readonly controllerContext: RuntimeControllerContext;
   private readonly renderer: WebGLRenderer | null;
   private runtimeScene: RuntimeSceneDefinition | null = null;