diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 6ed37823c..85e6ee318 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -258,7 +258,7 @@ class ManyRelatedMixin(object):
     def field_from_native(self, data, field_name, into):
         if self.readonly:
             return
-            
+
         try:
             # Form data
             value = data.getlist(self.source or field_name)