diff --git a/Library/Homebrew/dev-cmd/edit.rb b/Library/Homebrew/dev-cmd/edit.rb
index 9857d77530..c06b60c468 100644
--- a/Library/Homebrew/dev-cmd/edit.rb
+++ b/Library/Homebrew/dev-cmd/edit.rb
@@ -54,7 +54,7 @@ module Homebrew
     end
   end
 
-  sig { void }
+  sig { params(path: Pathname, cask: T::Boolean).void }
   def fail_with_message(path, cask)
     name = path.basename(".rb").to_s