diff --git a/spec/support/browsers/chrome.rb b/spec/support/browsers/chrome.rb
index 3f494d082c..398d59e02e 100644
--- a/spec/support/browsers/chrome.rb
+++ b/spec/support/browsers/chrome.rb
@@ -39,7 +39,7 @@ def register_chrome_headless(language, name: :"chrome_headless_#{language}")
       loggingPrefs: { browser: 'ALL' }
     )
 
-    yield options, capabilities
+    yield(options, capabilities) if block_given?
 
     client = Selenium::WebDriver::Remote::Http::Default.new
     client.read_timeout = 180
diff --git a/spec/support/browsers/firefox.rb b/spec/support/browsers/firefox.rb
index cab242768c..80c5a32426 100644
--- a/spec/support/browsers/firefox.rb
+++ b/spec/support/browsers/firefox.rb
@@ -40,7 +40,7 @@ def register_firefox_headless(language, name: :"firefox_headless_#{language}")
       loggingPrefs: { browser: 'ALL' }
     )
 
-    yield profile, options, capabilities
+    yield(profile, options, capabilities) if block_given?
 
     unless ActiveRecord::Type::Boolean.new.cast(ENV['OPENPROJECT_TESTING_NO_HEADLESS'])
       options.args << "--headless"