diff --git a/src/traits/JsonifiableZodSchemaObject.ts b/src/traits/JsonifiableZodSchemaObject.ts
index 4dbd88a..c747a8b 100644
--- a/src/traits/JsonifiableZodSchemaObject.ts
+++ b/src/traits/JsonifiableZodSchemaObject.ts
@@ -37,25 +37,23 @@ export const JsonifiableZodSchemaObject = <
     .build()
     .subtrait()
         .implement(Super => class JsonifiableZodSchemaObject extends Super {
+            declare ["constructor"]: typeof JsonifiableZodSchemaObject
+
             static readonly jsonifySchema   = jsonifySchema
             static readonly dejsonifySchema = dejsonifySchema
 
 
             jsonify(params?: Partial<z.ParseParams>) {
-                return (this.constructor as unknown as ImplStatic<typeof JsonifiableZodSchemaObject>)
-                    .jsonifySchema
-                    .parse(this, params)
+                return this.constructor.jsonifySchema.parse(this, params)
             }
 
             jsonifyPromise(params?: Partial<z.ParseParams>) {
-                return (this.constructor as unknown as ImplStatic<typeof JsonifiableZodSchemaObject>)
-                    .jsonifySchema
-                    .parseAsync(this, params)
+                return this.constructor.jsonifySchema.parseAsync(this, params)
             }
 
             jsonifyEffect(params?: Partial<z.ParseParams>) {
                 return parseZodSchemaEffect(
-                    (this.constructor as unknown as ImplStatic<typeof JsonifiableZodSchemaObject>).jsonifySchema,
+                    this.constructor.jsonifySchema,
                     this,
                     params,
                 )