diff --git a/backend/address2UPRN/main.py b/backend/address2UPRN/main.py
index 7e0baeaa..7ac5a54e 100644
--- a/backend/address2UPRN/main.py
+++ b/backend/address2UPRN/main.py
@@ -136,7 +136,7 @@ def get_uprn(
     """
     df = get_epc_data_with_postcode(postcode=postcode)
 
-    result: Optional[] = get_uprn_with_epc_df(
+    result: Optional[tuple[str, str, float]] = get_uprn_with_epc_df(
         user_inputed_address=user_inputed_address,
         epc_df=df,
         verbose=True,
@@ -561,4 +561,3 @@ def handler(event, context, local=False):
 # Don't add results to return messages as its too verbose
 # capture the exepection as e, into s3, to find the logs go to s3
 # Upload results to s3 as well as csv
-