diff --git a/lib/cartodb/tile_cache.js b/lib/cartodb/tile_cache.js
index 6a2af954..92b1737e 100644
--- a/lib/cartodb/tile_cache.js
+++ b/lib/cartodb/tile_cache.js
@@ -95,7 +95,8 @@ function GenericCache (cache_policy, cache_validator, ttl_timeout) {
                         modified_since = Date.parse(modified_since);
                         if(modified_since && modified_since <= timestamp*1000) {
                             me.cache_not_modified++;
-                            res.send(304);
+                            res.statusCode = 304;
+                            res.end();
                             return;
                         }
                     }