diff --git a/WindowServer/WSMessageLoop.cpp b/WindowServer/WSMessageLoop.cpp
index 0101d6d1b8..1d8f8a92e3 100644
--- a/WindowServer/WSMessageLoop.cpp
+++ b/WindowServer/WSMessageLoop.cpp
@@ -279,6 +279,9 @@ void WSMessageLoop::on_receive_from_client(int client_id, const WSAPI_ClientMess
         ASSERT(message.menu.shortcut_text_length < (ssize_t)sizeof(message.menu.shortcut_text));
         post_message(client, make<WSAPIAddMenuItemRequest>(client_id, message.menu.menu_id, message.menu.identifier, String(message.text, message.text_length), String(message.menu.shortcut_text, message.menu.shortcut_text_length)));
         break;
+    case WSAPI_ClientMessage::Type::AddMenuSeparator:
+        post_message(client, make<WSAPIAddMenuSeparatorRequest>(client_id, message.menu.menu_id));
+        break;
     case WSAPI_ClientMessage::Type::CreateWindow:
         ASSERT(message.text_length < (ssize_t)sizeof(message.text));
         post_message(client, make<WSAPICreateWindowRequest>(client_id, message.window.rect, String(message.text, message.text_length), message.window.has_alpha_channel, message.window.opacity, message.window.base_size, message.window.size_increment));