diff --git a/mitmproxy/addons/view.py b/mitmproxy/addons/view.py
index dd5795850..13a17c56e 100644
--- a/mitmproxy/addons/view.py
+++ b/mitmproxy/addons/view.py
@@ -10,7 +10,6 @@ The View:
 """
 import collections
 import typing
-import datetime
 
 import blinker
 import sortedcontainers
@@ -69,7 +68,7 @@ class _OrderKey:
 
 
 class OrderRequestStart(_OrderKey):
-    def generate(self, f: http.HTTPFlow) -> datetime.datetime:
+    def generate(self, f: http.HTTPFlow) -> int:
         return f.request.timestamp_start or 0