diff --git a/applications/bulk_upload_finaliser/Dockerfile b/applications/bulk_upload_finaliser/Dockerfile
index 6fa80c48..0c8f792f 100644
--- a/applications/bulk_upload_finaliser/Dockerfile
+++ b/applications/bulk_upload_finaliser/Dockerfile
@@ -20,7 +20,10 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 # DDD-shaped packages only -- no pandas, no legacy backend/. The finaliser writes
 # both `property` and the terminal `bulk_address_uploads` status through DDD repos
-# on its own PostgresConfig session (ADR-0013).
+# on its own PostgresConfig session (ADR-0013). `datatypes/` comes in via the
+# Property aggregate's import closure (domain/property/property.py -> site_notes ->
+# datatypes/epc/...), enforced by tests/test_lambda_packaging.py.
+COPY datatypes/ datatypes/
 COPY domain/ domain/
 COPY infrastructure/ infrastructure/
 COPY orchestration/ orchestration/