diff --git a/package.json b/package.json
index 0f8bae7..517d27e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@thilawyn/traitify-ts",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "type": "module",
   "publishConfig": {
     "registry": "https://git.jvalver.de/api/packages/thilawyn/npm/"
diff --git a/src/TraitExpression.ts b/src/TraitExpression.ts
index 2490377..ac00aaa 100644
--- a/src/TraitExpression.ts
+++ b/src/TraitExpression.ts
@@ -74,7 +74,7 @@ export class TraitExpression<
 }
 
 export namespace TraitExpression {
-    declare const nullSuperclassSymbol: unique symbol
+    const nullSuperclassSymbol = Symbol()
     export class NullSuperclass {
         static readonly [nullSuperclassSymbol]: true
         constructor(...args: any[]) {}