diff --git a/src/jsonifiable/makeJsonifiableSchemableClass.ts b/src/jsonifiable/makeJsonifiableSchemableClass.ts
index 943f744..d3e0478 100644
--- a/src/jsonifiable/makeJsonifiableSchemableClass.ts
+++ b/src/jsonifiable/makeJsonifiableSchemableClass.ts
@@ -1,8 +1,9 @@
 import { Effect } from "effect"
+import { AbstractClass, Class as ConcreteClass } from "type-fest"
 import { JsonifiableObject } from "type-fest/source/jsonifiable"
 import { z } from "zod"
 import { SchemableClass } from ".."
-import { Class, ClassType, StaticMembers, parseZodTypeEffect } from "../util"
+import { StaticMembers, parseZodTypeEffect } from "../util"
 
 
 export type MakeJsonifiableSchemableClassProps<
@@ -66,8 +67,7 @@ export function makeJsonifiableSchemableClass<
         SchemaUnknownKeys,
         SchemaCatchall,
         Values,
-        DefaultValues,
-        Type
+        DefaultValues
     >,
 
     SchemaT                    extends z.ZodRawShape,
@@ -86,16 +86,13 @@ export function makeJsonifiableSchemableClass<
     DejsonifySchemaCatchall    extends z.ZodTypeAny,
 
     JsonifiedValues            extends JsonifiableObject,
-
-    Type                       extends ClassType = "AbstractClass",
 >(
     extend: C | SchemableClass<
         SchemaT,
         SchemaUnknownKeys,
         SchemaCatchall,
         Values,
-        DefaultValues,
-        Type
+        DefaultValues
     >,
 
     props: MakeJsonifiableSchemableClassProps<
@@ -116,6 +113,12 @@ export function makeJsonifiableSchemableClass<
         JsonifiedValues
     >,
 ) {
+    type Class<T, Arguments extends unknown[]> = (
+        C extends ConcreteClass<any>
+            ? ConcreteClass<T, Arguments>
+            : AbstractClass<T, Arguments>
+    )
+
     const jsonifySchema = props.jsonifySchema({
         schema:  extend.schema,
         shape:   extend.schema.shape,
@@ -146,8 +149,6 @@ export function makeJsonifiableSchemableClass<
         }
     } as unknown as (
         Class<
-            Type,
-
             InstanceType<C> & {
                 readonly jsonifySchema:    typeof jsonifySchema,
                 readonly dejsonifySchema:  typeof dejsonifySchema,
@@ -210,19 +211,15 @@ export function pipeMakeJsonifiableSchemableClass<
             SchemaUnknownKeys,
             SchemaCatchall,
             Values,
-            DefaultValues,
-            Type
-        >,
-
-        Type extends ClassType = "AbstractClass",
+            DefaultValues
+        >
     >(
         extend: C | SchemableClass<
             SchemaT,
             SchemaUnknownKeys,
             SchemaCatchall,
             Values,
-            DefaultValues,
-            Type
+            DefaultValues
         >
     ) => makeJsonifiableSchemableClass(extend, props)
 }