diff --git a/src/effect/schema/class/MutableClass.ts b/src/effect/schema/class/MutableClass.ts
index dfb3861..c21aa1e 100644
--- a/src/effect/schema/class/MutableClass.ts
+++ b/src/effect/schema/class/MutableClass.ts
@@ -4,8 +4,8 @@ import type { TMutableClass } from "./TMutableClass"
 import type { HasFields, MissingSelfGeneric } from "./util"
 
 
-export const MutableClass = <Self = never>(identifier: string) => (
-    <Fields extends Struct.Fields>(
+export function MutableClass<Self = never>(identifier: string) {
+    return <Fields extends Struct.Fields>(
         fieldsOr:      Fields | HasFields<Fields>,
         annotations?:  Annotations.Schema<Self>,
     ): (
@@ -22,4 +22,4 @@ export const MutableClass = <Self = never>(identifier: string) => (
             >
     ) =>
         S.Class<Self>(identifier)(fieldsOr, annotations)
-)
+}