diff --git a/lib/asn1/base/node.js b/lib/asn1/base/node.js
index d676d21..f6649d8 100644
--- a/lib/asn1/base/node.js
+++ b/lib/asn1/base/node.js
@@ -218,6 +218,14 @@ Node.prototype.implicit = function implicit(num) {
   return this;
 };
 
+Node.prototype.cls = function cls(cls) {
+  const state = this._baseState;
+
+  state.cls = cls;
+
+  return this;
+};
+
 Node.prototype.obj = function obj() {
   const state = this._baseState;
   const args = Array.prototype.slice.call(arguments);
@@ -575,7 +583,7 @@ Node.prototype._encodeValue = function encode(data, reporter, parent) {
   // Encode data itself
   if (!state.any && state.choice === null) {
     const tag = state.implicit !== null ? state.implicit : state.tag;
-    const cls = state.implicit === null ? 'universal' : 'context';
+    const cls = state.cls ? state.cls : (state.implicit === null ? 'universal' : 'context');
 
     if (tag === null) {
       if (state.use === null)