diff --git a/src/runtime-three/runtime-host.ts b/src/runtime-three/runtime-host.ts
index d42737ea..4d14b573 100644
--- a/src/runtime-three/runtime-host.ts
+++ b/src/runtime-three/runtime-host.ts
@@ -89,6 +89,7 @@ import {
   disposeStarterMaterialTextureSet,
   type StarterMaterialTextureSet
 } from "../materials/starter-material-textures";
+import type { MaterialDef } from "../materials/starter-material-library";
 import {
   applyAdvancedRenderingRenderableShadowFlags,
   configureAdvancedRenderingShadowLight,