diff --git a/rest_framework/views.py b/rest_framework/views.py
index 327ebe903..e04fa8c30 100644
--- a/rest_framework/views.py
+++ b/rest_framework/views.py
@@ -496,7 +496,7 @@ class APIView(View):
         self.args = args
         self.kwargs = kwargs
         request = self.initialize_request(request, *args, **kwargs)
-        self.request = request
+        self.request: Request = request
         self.headers = self.default_response_headers  # deprecate?
 
         try: