diff --git a/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi b/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi
index 5d1daf7502..6be1ca3375 100644
--- a/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi
+++ b/Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi
@@ -2987,6 +2987,8 @@ class Cask::Cask
 
   def mdimporter(&block); end
 
+  def on_system_blocks_exist?(&block); end
+
   def pkg(&block); end
 
   def postflight(&block); end