diff --git a/lib/api_auth/request_drivers/net_http.rb b/lib/api_auth/request_drivers/net_http.rb
index 094b27bb..55d33e1f 100644
--- a/lib/api_auth/request_drivers/net_http.rb
+++ b/lib/api_auth/request_drivers/net_http.rb
@@ -1,3 +1,4 @@
+require 'time'
 module ApiAuth
   module RequestDrivers # :nodoc:
     class NetHttpRequest # :nodoc: