diff --git a/src/ZodSchemaClass.ts b/src/ZodSchemaClass.ts
index 9886e1f..d2dbf62 100644
--- a/src/ZodSchemaClass.ts
+++ b/src/ZodSchemaClass.ts
@@ -2,7 +2,7 @@ import { Effect, pipe } from "effect"
 import { AbstractClass, Class as ConcreteClass, Opaque } from "type-fest"
 import { z } from "zod"
 import { DefinedDefaultValuesTag, NewZodSchemaInstanceArgs, NewZodSchemaInstanceInput, TZodSchemaClass } from "."
-import { StaticMembers, parseZodTypeEffect } from "./util"
+import { Class, GetClassType, StaticMembers, parseZodTypeEffect } from "./util"
 
 
 type ExtendableClass = AbstractClass<any, []> & {
@@ -27,12 +27,6 @@ export function ZodSchemaClassOf<
         defaultValues:  Opaque<DefaultValues, DefinedDefaultValuesTag>
     },
 ) {
-    type Class<T, Arguments extends unknown[]> = (
-        Parent extends ConcreteClass<any>
-            ? ConcreteClass<T, Arguments>
-            : AbstractClass<T, Arguments>
-    )
-
     type TZodSchemaClassImpl = TZodSchemaClass<
         SchemaT,
         SchemaUnknownKeys,
@@ -118,6 +112,8 @@ export function ZodSchemaClassOf<
         }
     } as unknown as (
         Class<
+            GetClassType<Parent>,
+
             InstanceType<Parent> &
             InstanceType<TZodSchemaClassImpl>,