diff --git a/src/depiction_targeted_preproc/app_interface/collect_chunk.py b/src/depiction_targeted_preproc/app_interface/collect_chunk.py
index fa67286..41f3faa 100644
--- a/src/depiction_targeted_preproc/app_interface/collect_chunk.py
+++ b/src/depiction_targeted_preproc/app_interface/collect_chunk.py
@@ -14,6 +14,7 @@ def collect_chunk(workunit_ref: int | Path, chunk_dir: Path) -> None:
     chunk_dir = chunk_dir.absolute()
     zip_file_path = chunk_dir / f"{chunk_dir.name}.zip"
 
+    # TODO how to incorporate the cache_file parameter here, without "assuming" that it's in the parent directory?
     workunit_definition = WorkunitDefinition.from_ref(workunit_ref, client=Bfabric.from_config())
     workunit_id = workunit_definition.registration.workunit_id
 
diff --git a/src/depiction_targeted_preproc/app_interface/dispatch_app.py b/src/depiction_targeted_preproc/app_interface/dispatch_app.py
index c5ea358..832f807 100644
--- a/src/depiction_targeted_preproc/app_interface/dispatch_app.py
+++ b/src/depiction_targeted_preproc/app_interface/dispatch_app.py
@@ -34,7 +34,9 @@ def dispatch_job(self, resource: Resource, params: dict[str, Any]) -> Path:
 @app.default
 def dispatch_app(workunit_ref: int | Path, work_dir: Path) -> None:
     client = Bfabric.from_config()
-    workunit_definition = WorkunitDefinition.from_ref(workunit_ref, client)
+    workunit_definition = WorkunitDefinition.from_ref(
+        workunit_ref, client, cache_file=work_dir / "workunit_definition.yml"
+    )
     dispatcher = DispatchApp(client=client, config=config_msi_imzml(), out_dir=work_dir)
     dispatcher.dispatch_workunit(definition=workunit_definition)