diff --git a/lib/http/cookie.rb b/lib/http/cookie.rb
index e7c698b..7e280ab 100644
--- a/lib/http/cookie.rb
+++ b/lib/http/cookie.rb
@@ -505,7 +505,7 @@ class HTTP::Cookie
     map.each { |key, value|
       case key
       when *PERSISTENT_PROPERTIES
-        send(:"#{key}=", value)
+        __send__(:"#{key}=", value)
       end
     }
   end