diff --git a/routes/api/space_memberships.js b/routes/api/space_memberships.js
index 4f4b85a..8eed84a 100644
--- a/routes/api/space_memberships.js
+++ b/routes/api/space_memberships.js
@@ -92,7 +92,7 @@ router.post('/', function(req, res, next) {
 
   } else {
     res.status(403).json({
-      "error": "not_permitted"
+      "error": "Only administrators can do that."
     });
   }
 });