diff --git a/src/assets/delete-project-asset.ts b/src/assets/delete-project-asset.ts
index c93cabab..522c36aa 100644
--- a/src/assets/delete-project-asset.ts
+++ b/src/assets/delete-project-asset.ts
@@ -342,6 +342,7 @@ export function deleteProjectAssetFromProjectDocument(
 
   return {
     ...projectDocument,
+    materials: cleanupMaterialsForDeletedAsset(projectDocument.materials, asset),
     assets: nextAssets,
     foliagePrototypes: foliageCleanup.foliagePrototypes,
     scenes: didChangeScenes ? nextScenes : projectDocument.scenes