diff --git a/lib/internal/webidl.js b/lib/internal/webidl.js
index 071e8b9967e03a..4af564dad752e6 100644
--- a/lib/internal/webidl.js
+++ b/lib/internal/webidl.js
@@ -16,6 +16,7 @@ const {
   ObjectPrototypeIsPrototypeOf,
   SafeSet,
   String,
+  Symbol,
   SymbolIterator,
   TypeError,
 } = primordials;
@@ -30,14 +31,14 @@ const { kEmptyObject } = require('internal/util');
 
 const converters = { __proto__: null };
 
-const UNDEFINED = 1;
-const BOOLEAN = 2;
-const STRING = 3;
-const SYMBOL = 4;
-const NUMBER = 5;
-const BIGINT = 6;
-const NULL = 7;
-const OBJECT = 8;
+const UNDEFINED = Symbol('undefined');
+const BOOLEAN = Symbol('boolean');
+const STRING = Symbol('string');
+const SYMBOL = Symbol('symbol');
+const NUMBER = Symbol('number');
+const BIGINT = Symbol('bigint');
+const NULL = Symbol('null');
+const OBJECT = Symbol('object');
 
 /**
  * @see https://webidl.spec.whatwg.org/#es-any