diff --git a/activesupport/lib/active_support/core_ext/array/conversions.rb b/activesupport/lib/active_support/core_ext/array/conversions.rb
index a9882828ca..49ada8f174 100644
--- a/activesupport/lib/active_support/core_ext/array/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/array/conversions.rb
@@ -27,7 +27,7 @@ module ActiveSupport #:nodoc:
         # Calls <tt>to_param</tt> on all its elements and joins the result with
         # slashes. This is used by <tt>url_for</tt> in Action Pack. 
         def to_param
-          map(&:to_param).join '/'
+          collect { |e| e.to_param }.join '/'
         end
 
         # Converts an array into a string suitable for use as a URL query string,
@@ -35,7 +35,8 @@ module ActiveSupport #:nodoc:
         #
         #   ['Rails', 'coding'].to_query('hobbies') # => "hobbies%5B%5D=Rails&hobbies%5B%5D=coding"
         def to_query(key)
-          collect { |value| value.to_query("#{key}[]") } * '&'
+          prefix = "#{key}[]"
+          collect { |value| value.to_query(prefix) }.join '&'
         end
 
         def self.included(base) #:nodoc: