diff --git a/rest_auth/app_settings.py b/rest_auth/app_settings.py
index f3e9da1..da143fe 100644
--- a/rest_auth/app_settings.py
+++ b/rest_auth/app_settings.py
@@ -1,8 +1,11 @@
 from django.conf import settings
 
+if getattr(settings, 'REST_USE_KNOX', False):
+    from rest_auth.serializers import KnoxTokenSerializer as DefaultTokenSerializer,
+else:
+    from rest_auth.serializers import TokenSerializer as DefaultTokenSerializer,
+
 from rest_auth.serializers import (
-    TokenSerializer as DefaultTokenSerializer,
-    KnoxTokenSerializer as DefaultKnoxTokenSerializer,
     JWTSerializer as DefaultJWTSerializer,
     UserDetailsSerializer as DefaultUserDetailsSerializer,
     LoginSerializer as DefaultLoginSerializer,
@@ -19,9 +22,6 @@ serializers = getattr(settings, 'REST_AUTH_SERIALIZERS', {})
 TokenSerializer = import_callable(
     serializers.get('TOKEN_SERIALIZER', DefaultTokenSerializer))
 
-KnoxTokenSerializer = import_callable(
-    serializers.get('KNOX_TOKEN_SERIALIZER', DefaultKnoxTokenSerializer))
-
 JWTSerializer = import_callable(
     serializers.get('JWT_SERIALIZER', DefaultJWTSerializer))