diff --git a/src/jsonifiable/makeJsonifiableSchemableClass.ts b/src/jsonifiable/makeJsonifiableSchemableClass.ts
index ebbdf8a..a956b0b 100644
--- a/src/jsonifiable/makeJsonifiableSchemableClass.ts
+++ b/src/jsonifiable/makeJsonifiableSchemableClass.ts
@@ -86,7 +86,7 @@ export function makeJsonifiableSchemableClass<
         }
     } satisfies JsonifiableSchemableClass<typeof $jsonifiableSchemableConfig>
 
-    return jsonifiableClass as (
+    return jsonifiableClass as unknown as (
         Class<
             InstanceType<C> & JsonifiableSchemableObject<typeof $jsonifiableSchemableConfig>,
             ConstructorParameters<C>
diff --git a/src/tests.ts b/src/tests.ts
index b20c473..3eddcd5 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -28,3 +28,5 @@ const user2 = newSchemable(User, { id: 2n })
 
 console.log(user1)
 console.log(user2)
+
+console.log(await user2.jsonifyPromise())