diff --git a/actionpack/lib/action_controller/metal/http_authentication.rb b/actionpack/lib/action_controller/metal/http_authentication.rb
index e0c5eaca84922e65d2e72308adf58284708e9113..547cec7081a9482a2f87f227ca3dd7cd330119d0 100644
--- a/actionpack/lib/action_controller/metal/http_authentication.rb
+++ b/actionpack/lib/action_controller/metal/http_authentication.rb
@@ -441,9 +441,8 @@ def token_and_options(request)
       #
       # Returns String.
       def encode_credentials(token, options = {})
-        values = ["token=#{token.to_s.inspect}"]
-        options.each do |key, value|
-          values << "#{key}=#{value.to_s.inspect}"
+        values = ["token=#{token.to_s.inspect}"] + options.map do |key, value|
+          "#{key}=#{value.to_s.inspect}"
         end
         "Token #{values * ", "}"
       end