diff --git a/lib/node/node.js b/lib/node/node.js
index 10d9cc09..38e87286 100644
--- a/lib/node/node.js
+++ b/lib/node/node.js
@@ -342,6 +342,8 @@ class Node extends EventEmitter {
         case 'pool':
         case 'rpc':
         case 'http':
+        case 'ns':
+        case 'rs':
           assert(false, `${plugin.id} is already added.`);
           break;
       }
@@ -401,6 +403,12 @@ class Node extends EventEmitter {
       case 'http':
         assert(this.http, 'http is not loaded.');
         return this.http;
+      case 'rs':
+        assert(this.rs, 'rs is not loaded.');
+        return this.rs;
+      case 'ns':
+        assert(this.ns, 'ns is not loaded.');
+        return this.ns;
     }
 
     return this.plugins[name] || null;