diff --git a/Lib/Cookie.py b/Lib/Cookie.py
index 1ccfd16..fc6d9f6 100644
--- a/Lib/Cookie.py
+++ b/Lib/Cookie.py
@@ -624,7 +624,9 @@
         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()