diff --git a/Library/Homebrew/extend/os/linux/keg.rb b/Library/Homebrew/extend/os/linux/keg.rb
index 28860c0bfbb12..657afa3e52983 100644
--- a/Library/Homebrew/extend/os/linux/keg.rb
+++ b/Library/Homebrew/extend/os/linux/keg.rb
@@ -1,9 +1,8 @@
-# typed: true # rubocop:disable Sorbet/StrictSigil
+# typed: strict
 # frozen_string_literal: true
 
 class Keg
-  undef binary_executable_or_library_files
-
+  sig { returns(T::Array[Pathname]) }
   def binary_executable_or_library_files
     elf_files
   end