diff --git a/lib/wrapbox/configuration.rb b/lib/wrapbox/configuration.rb
index ec9f7f9..532f35f 100644
--- a/lib/wrapbox/configuration.rb
+++ b/lib/wrapbox/configuration.rb
@@ -1,3 +1,4 @@
+require "active_support"
 require "active_support/core_ext/hash"
 require "active_support/core_ext/string"