diff --git a/lib/ferrum/browser/options/chrome.rb b/lib/ferrum/browser/options/chrome.rb
index 5a38378c..14c1e1c0 100644
--- a/lib/ferrum/browser/options/chrome.rb
+++ b/lib/ferrum/browser/options/chrome.rb
@@ -42,18 +42,7 @@ class Chrome < Base
           # NOTE: --no-sandbox is not needed if you properly setup a user in the container.
           # https://github.com/ebidel/lighthouse-ci/blob/master/builder/Dockerfile#L35-L40
           # "no-sandbox" => nil,
-        }
-        # On Windows, the --disable-gpu flag is a temporary work around for a few bugs.
-        # See crbug.com/737678 for more information.
-        if Utils::Platform.windows?
-          DEFAULT_OPTIONS.merge!("disable-gpu" => nil)
-        end
-        # Use Metal on Apple Silicon
-        # https://github.com/google/angle#platform-support-via-backing-renderers
-        if Utils::Platform.mac_arm?
-          DEFAULT_OPTIONS.merge!("use-angle" => "metal")
-        end
-        DEFAULT_OPTIONS.freeze
+        }.freeze
 
         MAC_BIN_PATH = [
           "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
@@ -94,6 +83,12 @@ def merge_default(flags, options)
                      end
 
           defaults ||= DEFAULT_OPTIONS
+          # On Windows, the --disable-gpu flag is a temporary work around for a few bugs.
+          # See https://bugs.chromium.org/p/chromium/issues/detail?id=737678 for more information.
+          defaults = defaults.merge("disable-gpu" => nil) if Utils::Platform.windows?
+          # Use Metal on Apple Silicon
+          # https://github.com/google/angle#platform-support-via-backing-renderers
+          defaults = defaults.merge("use-angle" => "metal") if Utils::Platform.mac_arm?
           defaults.merge(flags)
         end
       end
diff --git a/spec/browser/options/chrome_spec.rb b/spec/browser/options/chrome_spec.rb
index 322939a7..d02f730a 100644
--- a/spec/browser/options/chrome_spec.rb
+++ b/spec/browser/options/chrome_spec.rb
@@ -1,38 +1,28 @@
 # frozen_string_literal: true
 
 describe Ferrum::Browser::Options::Chrome do
-  def reload_chrome_class
-    described_class.constants(false).each do |const|
-      described_class.send(:remove_const, const)
-    end
-    load 'ferrum/browser/options/chrome.rb'
-  end
+  let(:defaults) { described_class.options }
+  let(:options) { Ferrum::Browser::Options.new }
 
-  describe "DEFAULT_OPTIONS" do
-    it "includes `disable-gpu` flag only on windows" do
+  describe "#merge_default" do
+    it "includes --disable-gpu flag on windows" do
       allow(Ferrum::Utils::Platform).to receive(:windows?).and_return(true)
-      reload_chrome_class
-      expect(described_class::DEFAULT_OPTIONS).to include("disable-gpu" => nil)
+      expect(defaults.merge_default({}, options)).to include("disable-gpu" => nil)
+    end
 
+    it "excludes --disable-gpu flag on other platforms" do
       allow(Ferrum::Utils::Platform).to receive(:windows?).and_return(false)
-      reload_chrome_class
-      expect(described_class::DEFAULT_OPTIONS).not_to include("disable-gpu" => nil)
-
-      allow(Ferrum::Utils::Platform).to receive(:windows?).and_call_original
-      reload_chrome_class
+      expect(defaults.merge_default({}, options)).not_to include("disable-gpu" => nil)
     end
 
-    it "includes `use-angle=metal` flag only on mac arm" do
+    it "includes --use-angle=metal flag on mac arm" do
       allow(Ferrum::Utils::Platform).to receive(:mac_arm?).and_return(true)
-      reload_chrome_class
-      expect(described_class::DEFAULT_OPTIONS).to include("use-angle" => "metal")
+      expect(defaults.merge_default({}, options)).to include("use-angle" => "metal")
+    end
 
+    it "excludes --use-angle=metal flag on mac arm" do
       allow(Ferrum::Utils::Platform).to receive(:mac_arm?).and_return(false)
-      reload_chrome_class
-      expect(described_class::DEFAULT_OPTIONS).not_to include("use-angle" => "metal")
-
-      allow(Ferrum::Utils::Platform).to receive(:mac_arm?).and_call_original
-      reload_chrome_class
+      expect(defaults.merge_default({}, options)).not_to include("use-angle" => "metal")
     end
   end
 end