diff --git a/rest_framework/status.py b/rest_framework/status.py
index df0fa0f02..37c3ef91a 100644
--- a/rest_framework/status.py
+++ b/rest_framework/status.py
@@ -78,4 +78,5 @@ HTTP_503_SERVICE_UNAVAILABLE = 503
 HTTP_504_GATEWAY_TIMEOUT = 504
 HTTP_505_HTTP_VERSION_NOT_SUPPORTED = 505
 HTTP_507_INSUFFICIENT_STORAGE = 507
+HTTP_510_NOT_EXTENDED = 510
 HTTP_511_NETWORK_AUTHENTICATION_REQUIRED = 511