diff --git a/Casks/librewolf.rb b/Casks/librewolf.rb
index fe81633..6bb2abb 100644
--- a/Casks/librewolf.rb
+++ b/Casks/librewolf.rb
@@ -13,9 +13,8 @@ cask "librewolf" do
     command_wrapper "librewolf",
                     executable: "#{appdir}/LibreWolf.app/Contents/MacOS/librewolf"
 
-    postflight do
-      system_command "/usr/bin/xattr",
-                     args: ["-dr", "com.apple.quarantine", "#{appdir}/LibreWolf.app"]
+    postflight_steps do
+      run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{appdir}}/LibreWolf.app"]
     end
 
     zap trash: [