diff --git a/rest_framework/permissions.py b/rest_framework/permissions.py
index 30d844096..7ad18ce3d 100644
--- a/rest_framework/permissions.py
+++ b/rest_framework/permissions.py
@@ -8,7 +8,7 @@ from django.utils import six
 
 from rest_framework import exceptions
 
-SAFE_METHODS = ('GET', 'HEAD','OPTIONS')
+SAFE_METHODS = ('GET', 'HEAD', 'OPTIONS')
 
 
 class OperationHolderMixin: