diff --git a/openapi_schema_validator/validators.py b/openapi_schema_validator/validators.py
index 555df89..389a4e7 100644
--- a/openapi_schema_validator/validators.py
+++ b/openapi_schema_validator/validators.py
@@ -71,4 +71,4 @@ def iter_errors(self, instance, _schema=None):
                 'nullable': False,
             })
 
-        return super(OAS30Validator, self).iter_errors(instance, _schema)
+        return super(OAS30Validator, self.evolve(schema=_schema)).iter_errors(instance)