diff --git a/src/pg/sql/40_observatory_utility.sql b/src/pg/sql/40_observatory_utility.sql
index f3ec8a2..de942b5 100644
--- a/src/pg/sql/40_observatory_utility.sql
+++ b/src/pg/sql/40_observatory_utility.sql
@@ -213,5 +213,6 @@ BEGIN
   EXECUTE '
     SELECT MAX(dump_id) FROM observatory.obs_dump_version
   ' INTO result;
+  RETURN result;
 END;
 $$ LANGUAGE plpgsql;