diff --git a/backend/postcode_splitter/handler/Dockerfile b/backend/postcode_splitter/handler/Dockerfile
index 0ec53108..13ac309e 100644
--- a/backend/postcode_splitter/handler/Dockerfile
+++ b/backend/postcode_splitter/handler/Dockerfile
@@ -10,6 +10,7 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy necessary files for database and utility imports
 COPY utils/ utils/
 COPY backend/ backend/
+COPY datatypes/ datatypes/
 
 # Copy the handler
 COPY backend/postcode_splitter/main.py .