diff --git a/apps/search_indexes/documents/establishment.py b/apps/search_indexes/documents/establishment.py
index a053e2c7..2d43154e 100644
--- a/apps/search_indexes/documents/establishment.py
+++ b/apps/search_indexes/documents/establishment.py
@@ -51,6 +51,7 @@ class EstablishmentDocument(Document):
                 fields={'raw': fields.KeywordField()}
             ),
             'number': fields.IntegerField(),
+            'postal_code': fields.KeywordField(),
             'coordinates': fields.GeoPointField(attr='location_field_indexing'),
             # todo: remove if not used
             'city': fields.ObjectField(