diff --git a/Library/Homebrew/test/macos_runner_spec_spec.rb b/Library/Homebrew/test/macos_runner_spec_spec.rb
index 381bde96d8..e0711b1909 100644
--- a/Library/Homebrew/test/macos_runner_spec_spec.rb
+++ b/Library/Homebrew/test/macos_runner_spec_spec.rb
@@ -3,10 +3,10 @@
 require "macos_runner_spec"
 
 describe MacOSRunnerSpec do
-  let(:spec) { described_class.new(name: "macOS 11-arm64", runner: "11-arm64", cleanup: true) }
+  let(:spec) { described_class.new(name: "macOS 11-arm64", runner: "11-arm64", timeout: 90, cleanup: true) }
 
   it "has immutable attributes" do
-    [:name, :runner, :cleanup].each do |attribute|
+    [:name, :runner, :timeout, :cleanup].each do |attribute|
       expect(spec.respond_to?("#{attribute}=")).to be(false)
     end
   end