diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 95d5d3712..45c4d4edf 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -290,7 +290,7 @@ class Field(object):
         if data is empty:
             if getattr(self.root, 'partial', False):
                 raise SkipField()
-            if self.required and not self.allow_blank:
+            if self.required and not getattr(self, 'allow_blank', None):
                 self.fail('required')
             return self.get_default()