diff --git a/lib/tamashii/client/base.rb b/lib/tamashii/client/base.rb
index 8e903bc..d9fe318 100644
--- a/lib/tamashii/client/base.rb
+++ b/lib/tamashii/client/base.rb
@@ -194,7 +194,7 @@ def call_callback(event, *args, &block)
       end
 
       def start_websocket_driver
-        @driver = WebSocket::Driver.client(self)
+        @driver = ::WebSocket::Driver.client(self)
         @driver.on :open, proc { |e|
           @opened = true
           logger.info "WebSocket Server opened"