diff --git a/Library/Homebrew/rubocops/files.rb b/Library/Homebrew/rubocops/files.rb
index a27a37b6c0..33443232de 100644
--- a/Library/Homebrew/rubocops/files.rb
+++ b/Library/Homebrew/rubocops/files.rb
@@ -22,7 +22,7 @@ module RuboCop
           if actual_mode & 0444 != 0444
             problem format("Incorrect file permissions (%03<actual>o): chmod %<wanted>s %<path>s",
                            actual: actual_mode & 0777,
-                           wanted: "+r",
+                           wanted: "a+r",
                            path:   file_path)
           end
           # Check that the file is user-writeable.
diff --git a/Library/Homebrew/test/rubocops/files_spec.rb b/Library/Homebrew/test/rubocops/files_spec.rb
index 52071477fa..d6f9505fb5 100644
--- a/Library/Homebrew/test/rubocops/files_spec.rb
+++ b/Library/Homebrew/test/rubocops/files_spec.rb
@@ -13,7 +13,7 @@ RSpec.describe RuboCop::Cop::FormulaAudit::Files do
 
         expect_offense(<<~RUBY, file)
           class Foo < Formula
-          ^^^^^^^^^^^^^^^^^^^ FormulaAudit/Files: Incorrect file permissions (000): chmod +r #{filename}
+          ^^^^^^^^^^^^^^^^^^^ FormulaAudit/Files: Incorrect file permissions (000): chmod a+r #{filename}
             url "https://brew.sh/foo-1.0.tgz"
           end
         RUBY