diff --git a/lib/redmine/wiki_formatting/macros.rb b/lib/redmine/wiki_formatting/macros.rb
index 64b7814b9..5bafd269b 100644
--- a/lib/redmine/wiki_formatting/macros.rb
+++ b/lib/redmine/wiki_formatting/macros.rb
@@ -147,10 +147,10 @@ module Redmine
           unless block_given?
             raise "Can not create a macro without a block!"
           end
-          name = name.to_sym if name.is_a?(String)
+          name = name.to_s.downcase.to_sym
           available_macros[name] = {:desc => @@desc || ''}.merge(options)
           @@desc = nil
-          Definitions.send :define_method, "macro_#{name}".downcase, &block
+          Definitions.send :define_method, "macro_#{name}", &block
         end
 
         # Sets description for the next macro to be defined
diff --git a/test/unit/lib/redmine/wiki_formatting/macros_test.rb b/test/unit/lib/redmine/wiki_formatting/macros_test.rb
index cd3ac7a48..d014aa5e6 100644
--- a/test/unit/lib/redmine/wiki_formatting/macros_test.rb
+++ b/test/unit/lib/redmine/wiki_formatting/macros_test.rb
@@ -78,6 +78,12 @@ class Redmine::WikiFormatting::MacrosTest < ActionView::TestCase
     assert_equal "<p>Baz: (arg1,arg2) (String) (line1\nline2)</p>", textilizable("{{baz(arg1, arg2)\nline1\nline2\n}}")
   end
 
+  def test_macro_name_with_upper_case
+    Redmine::WikiFormatting::Macros.macro(:UpperCase) {|obj, args| "Upper"}
+
+    assert_equal "<p>Upper</p>", textilizable("{{UpperCase}}")
+  end
+
   def test_multiple_macros_on_the_same_line
     Redmine::WikiFormatting::Macros.macro :foo do |obj, args|
       args.any? ? "args: #{args.join(',')}" : "no args"