diff --git a/backend/address2UPRN/handler/Dockerfile b/backend/address2UPRN/handler/Dockerfile
index fddbcaab2..f7b859730 100644
--- a/backend/address2UPRN/handler/Dockerfile
+++ b/backend/address2UPRN/handler/Dockerfile
@@ -39,6 +39,10 @@ COPY infrastructure/ infrastructure/
 # EpcClientService -> datatypes.epc.domain.mapper -> domain.sap10_calculator;
 # without this the lambda fails at init with "No module named 'domain'".
 COPY domain/ domain/
+# main.py resolves historic-EPC UPRNs via repositories.historic_epc.* (the
+# HistoricEpcResolver + S3 repository); without this the lambda fails at init
+# with "No module named 'repositories'".
+COPY repositories/ repositories/
 
 # Copy the handler
 COPY backend/address2UPRN/main.py .