diff --git a/doiwos-dumps/02-extract-fields.ini b/doiwos-dumps/02-extract-fields.ini
index 6531e13..9d90637 100644
--- a/doiwos-dumps/02-extract-fields.ini
+++ b/doiwos-dumps/02-extract-fields.ini
@@ -65,7 +65,7 @@
 
 path = grants
 value = get('static_data.fullrecord_metadata.fund_ack.grants.grant').castArray().map(grant => ({ \
-    ids:_.chain(grant).get('grant_ids').castArray().map('grant_id').compact(), \
+    ids:_.chain(grant).get('grant_ids').castArray().map('grant_id').compact().flatten(), \
     agency: _.chain(grant).get('grant_agency_names').castArray().map('content').compact() \
 }))