diff --git a/lib/app_profiler.rb b/lib/app_profiler.rb
index 7e6e1d6..506d2a1 100644
--- a/lib/app_profiler.rb
+++ b/lib/app_profiler.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require "active_support"
 require "active_support/core_ext/class"
 require "active_support/core_ext/module"
 require "logger"