diff --git a/announcement.gemspec b/announcement.gemspec
index edb4e7e..b31745d 100644
--- a/announcement.gemspec
+++ b/announcement.gemspec
@@ -100,7 +100,7 @@ if old_gemfile_text != new_gemfile_text
     Bundler.with_clean_env do
         puts env_pwd
         puts mode
-        exec("cd #{env_pwd} && screen -d -m -S bundle_update_#{dir_name} ./bundle_update_background.sh")
+        exec("cd #{env_pwd} && screen -d -m -S bundle_update_#{dir_name} #{env_pwd}/bundle_update_background.sh")
     end
   end
   now_priority = Thread.current.priority.to_i