diff --git a/lib/omniauth/strategies/azure_activedirectory.rb b/lib/omniauth/strategies/azure_activedirectory.rb
index 20339c5..b5a2e1b 100644
--- a/lib/omniauth/strategies/azure_activedirectory.rb
+++ b/lib/omniauth/strategies/azure_activedirectory.rb
@@ -24,6 +24,7 @@
 require 'omniauth'
 require 'openssl'
 require 'securerandom'
+require 'net/http'
 
 module OmniAuth
   module Strategies