diff --git a/lib/singed.rb b/lib/singed.rb
index 8e96fbf..a4fd033 100644
--- a/lib/singed.rb
+++ b/lib/singed.rb
@@ -2,6 +2,7 @@
 
 require "json"
 require "stackprof"
+require "pathname"
 
 module Singed
   extend self