diff --git a/server/extension/sql/85_isodistance.sql b/server/extension/sql/85_isodistance.sql
index 29beddb..6349015 100644
--- a/server/extension/sql/85_isodistance.sql
+++ b/server/extension/sql/85_isodistance.sql
@@ -31,6 +31,11 @@ RETURNS SETOF cdb_dataservices_server.isoline AS $$
 
   mapzen_plan = plpy.prepare("SELECT cdb_dataservices_server._cdb_mapzen_isolines($1, $2, $3, $4, $5, $6, $7) as isoline; ", ["text", "text", "text", "geometry(Geometry, 4326)", "text", "integer[]", "text[]"])
   result = plpy.execute(mapzen_plan, [username, orgname, type, source, mode, range, options])
+  isolines = []
+  for element in result:
+    isoline = element['isoline']
+    isoline = isoline.translate(None, "()").split(',')
+    isolines.append(isoline)
 
-  return result
+  return isolines
 $$ LANGUAGE plpythonu;
diff --git a/server/extension/sql/90_isochrone.sql b/server/extension/sql/90_isochrone.sql
index 409cf39..11f11cb 100644
--- a/server/extension/sql/90_isochrone.sql
+++ b/server/extension/sql/90_isochrone.sql
@@ -32,6 +32,11 @@ RETURNS SETOF cdb_dataservices_server.isoline AS $$
 
   mapzen_plan = plpy.prepare("SELECT cdb_dataservices_server._cdb_mapzen_isolines($1, $2, $3, $4, $5, $6, $7) as isoline; ", ["text", "text", "text", "geometry(Geometry, 4326)", "text", "integer[]", "text[]"])
   result = plpy.execute(mapzen_plan, [username, orgname, type, source, mode, range, options])
+  isolines = []
+  for element in result:
+    isoline = element['isoline']
+    isoline = isoline.translate(None, "()").split(',') #--TODO what is this for?
+    isolines.append(isoline)
 
-  return result
+  return isolines
 $$ LANGUAGE plpythonu;