diff --git a/src/index.ts b/src/index.ts
index cf13964..0d273bc 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -28,7 +28,7 @@ export type Trait<
 export type TraitApplier<
     C extends AbstractClass<any>
 > =
-    (Parent: AbstractConstructor<any>) => C
+    (Parent: AbstractConstructor<object>) => C
 
 /**
  * Returns the class type of a trait.