diff --git a/src/json-type/type/classes/AbstractType.ts b/src/json-type/type/classes/AbstractType.ts
index 4f684197c0..12fdc3d5c8 100644
--- a/src/json-type/type/classes/AbstractType.ts
+++ b/src/json-type/type/classes/AbstractType.ts
@@ -55,7 +55,7 @@ export abstract class AbstractType<S extends schema.Schema> implements BaseType<
   protected abstract schema: S;
 
   public getSystem(): TypeSystem {
-    const system = type.system;
+    const system = this.system;
     if (!system) throw new Error('NO_SYSTEM');
     return system;
   }