diff --git a/websockets/commons/api.w b/websockets/commons/api.w
index 89cec6f9..8f8587fc 100644
--- a/websockets/commons/api.w
+++ b/websockets/commons/api.w
@@ -15,11 +15,6 @@ pub interface IWebSocket extends std.IResource {
    */
   onMessage(handler: inflight(str, str): void): void;
 
-  /**
-   * Initialize the WebSocket (necessary only in the sim, to be removed in the future).
-   */
-  initialize(): void;
-
   /**
    * Sends a message through the WebSocket with inflight handling.
    */