diff --git a/Lib/http/cookies.py b/Lib/http/cookies.py
index 695161a..9cb80b9 100644
--- a/Lib/http/cookies.py
+++ b/Lib/http/cookies.py
@@ -535,7 +535,9 @@
         if type(rawdata) == type(""):
             self.__ParseString(rawdata)
         else:
-            self.update(rawdata)
+            # self.update() wouldn't call our custom __setitem__
+            for k, v in rawdata.items():
+                self[k] = v
         return
     # end load()