diff --git a/lib/cartodb/middleware/rate-limit.js b/lib/cartodb/middleware/rate-limit.js
index 4e69a031..516709da 100644
--- a/lib/cartodb/middleware/rate-limit.js
+++ b/lib/cartodb/middleware/rate-limit.js
@@ -49,9 +49,9 @@ function rateLimitFn(userLimitsApi, endpointGroup = null) {
             });
     
             if (isBlocked) {
-                const err = new Error('You are over the limits.');
-                err.http_status = 429;
-                return next(err);
+                const rateLimitError = new Error('You are over the limits.');
+                rateLimitError.http_status = 429;
+                return next(rateLimitError);
             }
     
             return next();