diff --git a/websocket-sharp/Net/CookieCollection.cs b/websocket-sharp/Net/CookieCollection.cs
index 2b9e23fa..bf7591de 100644
--- a/websocket-sharp/Net/CookieCollection.cs
+++ b/websocket-sharp/Net/CookieCollection.cs
@@ -277,7 +277,7 @@ namespace WebSocketSharp.Net
 
         if (idx == 0) {
           if (cookie != null) {
-            ret.Add (cookie);
+            ret.add (cookie);
             cookie = null;
           }
 
@@ -328,7 +328,7 @@ namespace WebSocketSharp.Net
         }
 
         if (cookie != null)
-          ret.Add (cookie);
+          ret.add (cookie);
 
         cookie = new Cookie (name, val);
 
@@ -337,7 +337,7 @@ namespace WebSocketSharp.Net
       }
 
       if (cookie != null)
-        ret.Add (cookie);
+        ret.add (cookie);
 
       return ret;
     }