diff --git a/src/TZodSchemaClass.ts b/src/TZodSchemaClass.ts
index 4dd40c7..3697473 100644
--- a/src/TZodSchemaClass.ts
+++ b/src/TZodSchemaClass.ts
@@ -2,7 +2,7 @@ import { Effect } from "effect"
 import { AbstractClass, Class as ConcreteClass, HasRequiredKeys, Opaque } from "type-fest"
 import { z } from "zod"
 import { DefinedDefaultValuesTag } from "."
-import { Class, ClassType, GetClassType, StaticMembers } from "./util"
+import { Class, ClassType, ClassesInstances, ClassesStaticMembers, GetClassType, MergeInheritanceTree } from "./util"
 
 
 export type NewZodSchemaInstanceInput<
@@ -25,20 +25,22 @@ export type NewZodSchemaInstanceArgs<Input extends object> =
 
 
 type ExtendZodSchemaClass<
-    Parent extends AbstractClass<any>,
-    Self   extends AbstractClass<any>,
+    Super extends AbstractClass<any>,
+    Self  extends AbstractClass<any>,
 > = (
     Class<
-        GetClassType<Parent>,
+        GetClassType<Super>,
 
-        Omit<InstanceType<Parent>, keyof InstanceType<DefaultZodSchemaClass>> &
-        InstanceType<Self>,
+        MergeInheritanceTree<
+            ClassesInstances<[Super, Self]>
+        >,
 
         ConstructorParameters<Self>
     > &
 
-    Omit<Parent, keyof DefaultZodSchemaClass> &
-    StaticMembers<Self>
+    MergeInheritanceTree<
+        ClassesStaticMembers<[Super, Self]>
+    >
 )
 
 
@@ -82,7 +84,7 @@ export type TZodSchemaClass<
         ): Effect.Effect<never, z.ZodError<Values>, Values>
 
         extend<
-            Parent                    extends AbstractClass<any>,
+            Super                     extends AbstractClass<any>,
 
             ExtendedSchemaT           extends z.ZodRawShape,
             ExtendedSchemaUnknownKeys extends z.UnknownKeysParam,
@@ -91,7 +93,7 @@ export type TZodSchemaClass<
             ExtendedValues            extends Values,
             ExtendedDefaultValues     extends Partial<ExtendedValues>,
         >(
-            this: Parent,
+            this: Super,
 
             props: {
                 schema: (props: {
@@ -102,7 +104,7 @@ export type TZodSchemaClass<
                 defaultValues: (defaultValues: DefaultValues) => Opaque<ExtendedDefaultValues, DefinedDefaultValuesTag>
             },
         ): ExtendZodSchemaClass<
-            Parent,
+            Super,
 
             TZodSchemaClass<
                 ExtendedSchemaT,
diff --git a/src/ZodSchemaClass.ts b/src/ZodSchemaClass.ts
index ff4569f..bb1e85d 100644
--- a/src/ZodSchemaClass.ts
+++ b/src/ZodSchemaClass.ts
@@ -6,7 +6,7 @@ import { Class, GetClassType, MergeInheritanceTree, MergeInheritanceTreeWithoutO
 
 
 export function ZodSchemaClassOf<
-    Parent            extends AbstractClass<any, []>,
+    Super             extends AbstractClass<any, []>,
 
     SchemaT           extends z.ZodRawShape,
     SchemaUnknownKeys extends z.UnknownKeysParam,
@@ -15,7 +15,7 @@ export function ZodSchemaClassOf<
     Values            extends {},
     DefaultValues     extends Partial<Values>,
 >(
-    of: Parent,
+    of: Super,
 
     { schema, defaultValues }: {
         schema:         z.ZodObject<SchemaT, SchemaUnknownKeys, SchemaCatchall, Values, Values>
@@ -107,10 +107,10 @@ export function ZodSchemaClassOf<
         }
     } as unknown as (
         Class<
-            GetClassType<Parent>,
+            GetClassType<Super>,
 
             MergeInheritanceTreeWithoutOverriding<[
-                InstanceType<Parent>,
+                InstanceType<Super>,
                 InstanceType<TZodSchemaClassImpl>,
             ]> &
 
@@ -118,13 +118,15 @@ export function ZodSchemaClassOf<
         > &
 
         MergeInheritanceTree<[
-            StaticMembers<Parent>,
+            StaticMembers<Super>,
             StaticMembers<TZodSchemaClassImpl>,
         ]>
     )
 }
 
 
+class DefaultRoot {}
+
 export function ZodSchemaClass<
     SchemaT           extends z.ZodRawShape,
     SchemaUnknownKeys extends z.UnknownKeysParam,
@@ -138,5 +140,5 @@ export function ZodSchemaClass<
         defaultValues:  Opaque<DefaultValues, DefinedDefaultValuesTag>
     },
 ) {
-    return ZodSchemaClassOf(Object, props)
+    return ZodSchemaClassOf(DefaultRoot, props)
 }