diff --git a/script/prepare_deploy b/script/prepare_deploy
index f5dad55b..d8931438 100755
--- a/script/prepare_deploy
+++ b/script/prepare_deploy
@@ -6,6 +6,7 @@ require 'fileutils'
 def fingerprint(file_path)
   # file_path is relative to public
   public_file_path = "public/#{file_path}"
+  return unless File.exists?(public_file_path)
   digest = Digest::MD5.file public_file_path
   extension = File.extname(file_path)
   basename  = File.basename(file_path, extension)