diff --git a/src/pg/sql/44_observatory_geometries.sql b/src/pg/sql/44_observatory_geometries.sql
index 7b06274..44c3a4e 100644
--- a/src/pg/sql/44_observatory_geometries.sql
+++ b/src/pg/sql/44_observatory_geometries.sql
@@ -537,9 +537,9 @@ BEGIN
   RETURN QUERY
   EXECUTE
   format($string$
-    SELECT geoid_ct.colname As geoid_colname,
-           tablename,
-           geom_ct.colname As geom_colname
+    SELECT geoid_ct.colname As geoid_colname::text,
+           tablename::text,
+           geom_ct.colname As geom_colname::text
     FROM observatory.obs_column_table As geoid_ct,
          observatory.obs_table As geom_t,
          observatory.obs_column_table As geom_ct,