diff --git a/src/Schema.ts b/src/Schema.ts
index f0d0fab..eaa946f 100644
--- a/src/Schema.ts
+++ b/src/Schema.ts
@@ -18,11 +18,6 @@ import { SchemaJSON } from './types'
 export function parceable() {
 
 	return (target: object, propertyKey: string | symbol, descriptor: TypedPropertyDescriptor<any>) => {
-		// make sure the target is of SchemaItem
-		if (!(target instanceof SchemaItem)) {
-			throw new Error('the decorator is only usable on Schema')
-		}
-
 		// make sur the property exists in the target
 		if (!(propertyKey in target)) {
 			throw new Error('property not set in object')
diff --git a/src/SchemaItem.ts b/src/SchemaItem.ts
index 18079f1..b4d343d 100644
--- a/src/SchemaItem.ts
+++ b/src/SchemaItem.ts
@@ -1,9 +1,7 @@
 /* eslint-disable id-length */
 import { objectClean } from '@dzeio/object-util'
 import { StandardSchemaV1 } from '@standard-schema/spec'
-import SchemaNullable from 'items/nullable'
-import { isNull } from './helpers'
-import Schema, { parceable } from './Schema'
+import Schema, { isNull, parceable, SchemaNullable } from './Schema'
 import { SchemaJSON, ValidationError, ValidationResult } from './types'
 export default abstract class SchemaItem<Type = any> implements StandardSchemaV1<Type> {