diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 41d6105ca..c6b51c49b 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -304,7 +304,7 @@ class Field(object):
         'required': _('This field is required.'),
         'null': _('This field may not be null.')
     }
-    default_validators = []
+    default_validators = ()
     default_empty_html = empty
     initial = None