diff --git a/src/index.ts b/src/index.ts
index 0d273bc..c1ed0f4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -18,9 +18,11 @@ export type Trait<
     C extends AbstractClass<any>
 > = Opaque<
     TraitApplier<C>,
-    "thilatrait/Trait"
+    "@thilawyn/thilatrait/Trait"
 >
 
+export type TraitApplierTag = "@thilawyn/thilatrait/Trait"
+
 /**
  * Represents the function signature for applying a trait to a parent class.
  * @template C - The abstract class type.
@@ -28,7 +30,7 @@ export type Trait<
 export type TraitApplier<
     C extends AbstractClass<any>
 > =
-    (Parent: AbstractConstructor<object>) => C
+    (Parent: Opaque<AbstractConstructor<object>, TraitApplierTag>) => Opaque<C, TraitApplierTag>
 
 /**
  * Returns the class type of a trait.
@@ -154,7 +156,7 @@ export function extendsAndExpresses<
 ) {
     return traits.reduce(
         (previous, trait) => trait(previous),
-        extend,
+        extend as Opaque<C, TraitApplierTag>,
     ) as (
         AbstractClass<
             InstanceType<C> &