diff --git a/resources/parser/data_sets/openaddresses.yaml b/resources/parser/data_sets/openaddresses.yaml
index bfa56e5b..2b9560d4 100644
--- a/resources/parser/data_sets/openaddresses.yaml
+++ b/resources/parser/data_sets/openaddresses.yaml
@@ -843,7 +843,7 @@ countries:
                           "VITERBO": VT
 
         subdirs:
-            04:
+            "04":
                 files:
                     - filename: acerra.csv
                       add_osm_boundaries: true