diff --git a/packages/nodos-core/lib/http/Response.js b/packages/nodos-core/lib/http/Response.js
index 1a4eaabc..f3f61516 100644
--- a/packages/nodos-core/lib/http/Response.js
+++ b/packages/nodos-core/lib/http/Response.js
@@ -94,8 +94,8 @@ class Response {
    */
   render(locals = {}, template = this.templateName) {
     this.responseType = 'rendering';
-    // FIXME: check if property already exists
-    Object.assign(this.locals, locals);
+    const self = this;
+    Object.entries(locals).forEach(([key, value]) => self.addLocal(key, value));
     this.templateName = template;
   }