diff --git a/src/extendSchemable.ts b/src/extendSchemable.ts
index eee5111..6c68b2e 100644
--- a/src/extendSchemable.ts
+++ b/src/extendSchemable.ts
@@ -1,4 +1,4 @@
-import { AbstractClass } from "type-fest"
+import { AbstractClass, Class } from "type-fest"
 import { z } from "zod"
 import { SchemableClass } from "."
 import { StaticMembers } from "./util"
@@ -43,6 +43,12 @@ export function extendSchemable<
 
     defaultValuesApplier: (defaultValues: ExtendDefaultValues) => DefaultValues,
 ) {
+    type ClassKind<T, Arguments extends unknown[]> = (
+        C extends Class<any>
+            ? Class<T, Arguments>
+            : AbstractClass<T, Arguments>
+    )
+
     const schema        = schemaApplier(extend.schema)
     const defaultValues = defaultValuesApplier(extend.defaultValues)
 
@@ -53,7 +59,7 @@ export function extendSchemable<
         static readonly defaultValues = defaultValues
                readonly defaultValues = defaultValues
     } as unknown as (
-        AbstractClass<
+        ClassKind<
             Omit<C, "schema" | "defaultValues" | keyof ExtendSchemaValues> &
             {
                 readonly schema:         typeof schema,
diff --git a/src/tests.ts b/src/tests.ts
index f17f90b..3e1b408 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -16,7 +16,7 @@ class Test1 {
 const Test2 = extendSchemable(
     Test1,
     schema => schema.extend({ prout: z.literal("ruquier"), ruquier: z.number() }),
-    defaultValues => ({ prout: "ruquier" as const }),
+    () => ({ prout: "ruquier" as const }),
 )
 
 Test2.defaultValues