diff --git a/lib/minitest/chat_notifier_plugin.rb b/lib/minitest/chat_notifier_plugin.rb
index 9cf754b..f8e8a2d 100644
--- a/lib/minitest/chat_notifier_plugin.rb
+++ b/lib/minitest/chat_notifier_plugin.rb
@@ -1,5 +1,6 @@
 module Minitest
   def self.plugin_chat_notifier_init(options)
+    require "chat_notifier"
     Minitest.reporter << ChatNotifierPlugin.new(options[:io], options)
   end
 
@@ -8,7 +9,7 @@ class ChatNotifierPlugin < SummaryReporter
     Summary = Data.define(:failed_examples)
     def report
       summary = Summary[(results.map{ |result| ExceptionLocation[result.source_location] })]
-      ChatNotifier.call(summary:)
+      ::ChatNotifier.call(summary:)
     end
   end
 end
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