diff --git a/Casks/runware.rb b/Casks/runware.rb
index d2539c9..9751726 100644
--- a/Casks/runware.rb
+++ b/Casks/runware.rb
@@ -33,7 +33,7 @@
 
   binary "runware"
 
-  postflight do
+  postflight_steps do
     if OS.mac?
       system_command "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "#{staged_path}/runware"]
     end