diff --git a/rest_framework/status.py b/rest_framework/status.py
index 2d725573e..06d090733 100644
--- a/rest_framework/status.py
+++ b/rest_framework/status.py
@@ -84,4 +84,5 @@ HTTP_506_VARIANT_ALSO_NEGOTIATES = 506
 HTTP_507_INSUFFICIENT_STORAGE = 507
 HTTP_508_LOOP_DETECTED = 508
 HTTP_509_BANDWIDTH_LIMIT_EXCEEDED = 509
+HTTP_510_NOT_EXTENDED = 510
 HTTP_511_NETWORK_AUTHENTICATION_REQUIRED = 511