diff --git a/src/effect/schema/tests.ts b/src/effect/schema/tests.ts
index 25cc94a..6ea33e9 100644
--- a/src/effect/schema/tests.ts
+++ b/src/effect/schema/tests.ts
@@ -1,15 +1,13 @@
 import { Schema as S } from "@effect/schema"
-import { pipe } from "effect"
 import { reaction, runInAction } from "mobx"
 import { MobXObservable, MutableTaggedClass } from "./class"
 
 
-class User extends pipe(
-    MutableTaggedClass<User>()("User", {
-        id: S.BigIntFromSelf,
-        role: S.Union(S.Literal("BasicUser"), S.Literal("Admin")),
-    }),
-    MobXObservable,
+class User extends MutableTaggedClass<User>()("User", {
+    id:    S.BigIntFromSelf,
+    role:  S.Union(S.Literal("BasicUser"), S.Literal("Admin")),
+}).pipe(
+    MobXObservable
 ) {}
 
 const user1 = new User({ id: -1n, role: "BasicUser" })