diff --git a/src/extendSchemableClass.ts b/src/extendSchemableClass.ts
index 2d06f72..5d30d2b 100644
--- a/src/extendSchemableClass.ts
+++ b/src/extendSchemableClass.ts
@@ -1,4 +1,4 @@
-import { AbstractClass, Class } from "type-fest"
+import { AbstractClass, Class as ConcreteClass } from "type-fest"
 import { z } from "zod"
 import { SchemableClass } from "."
 import { StaticMembers } from "./util"
@@ -23,6 +23,7 @@ export function extendSchemableClass<
     SchemaUnknownKeys       extends z.UnknownKeysParam,
     SchemaCatchall          extends z.ZodTypeAny,
     SchemaValues            extends ExtendSchemaValues,
+
     DefaultValues           extends Partial<SchemaValues>,
 >(
     extend: C | SchemableClass<
@@ -43,9 +44,9 @@ export function extendSchemableClass<
 
     defaultValuesApplier: (defaultValues: ExtendDefaultValues) => DefaultValues,
 ) {
-    type ClassKind<T, Arguments extends unknown[]> = (
-        C extends Class<any>
-            ? Class<T, Arguments>
+    type Class<T, Arguments extends unknown[]> = (
+        C extends ConcreteClass<any>
+            ? ConcreteClass<T, Arguments>
             : AbstractClass<T, Arguments>
     )
 
@@ -59,7 +60,7 @@ export function extendSchemableClass<
         static readonly defaultValues = defaultValues
                readonly defaultValues = defaultValues
     } as unknown as (
-        ClassKind<
+        Class<
             Omit<InstanceType<C>, "schema" | "defaultValues" | keyof ExtendSchemaValues> &
             {
                 readonly schema:         typeof schema,