diff --git a/lib/cartodb/api/middlewares/cache-control-header.js b/lib/cartodb/api/middlewares/cache-control-header.js
index c3bb9673..c3c57ea0 100644
--- a/lib/cartodb/api/middlewares/cache-control-header.js
+++ b/lib/cartodb/api/middlewares/cache-control-header.js
@@ -42,5 +42,5 @@ module.exports = function setCacheControlHeader ({
 };
 
 function everyAffectedTablesCanBeInvalidated (affectedTables) {
-    return affectedTables && affectedTables.getTables().every(table => !!table.updated_at);
+    return affectedTables && affectedTables.getTables().every(table => table.updated_at !== null);
 }