diff --git a/scripts/geodata/osm/formatter.py b/scripts/geodata/osm/formatter.py
index 97401dae..70460ce5 100644
--- a/scripts/geodata/osm/formatter.py
+++ b/scripts/geodata/osm/formatter.py
@@ -396,6 +396,7 @@ class OSMAddressFormatter(object):
         place_tags = []
 
         postal_code = revised_tags.get(AddressFormatter.POSTCODE, None)
+        postal_codes = []
         if postal_code:
             postal_codes = parse_osm_number_range(postal_code, parse_letter_range=False)