diff --git a/lib/rdoc/generator/darkfish.rb b/lib/rdoc/generator/darkfish.rb
index b46861d009..60e0265e8c 100644
--- a/lib/rdoc/generator/darkfish.rb
+++ b/lib/rdoc/generator/darkfish.rb
@@ -220,8 +220,8 @@ class RDoc::Generator::Darkfish
       install_rdoc_static_file @template_dir + item, "./#{item}", options
     end
 
-    @options.template_stylesheets.each do |stylesheet|
-      FileUtils.cp stylesheet, '.', options
+    unless @options.template_stylesheets.empty?
+      FileUtils.cp @options.template_stylesheets, '.', **options
     end
 
     Dir[(@template_dir + "{js,images}/**/*").to_s].each do |path|
diff --git a/lib/rdoc/generator/template/darkfish/_head.rhtml b/lib/rdoc/generator/template/darkfish/_head.rhtml
index e61fce1b9a..4f331245c3 100644
--- a/lib/rdoc/generator/template/darkfish/_head.rhtml
+++ b/lib/rdoc/generator/template/darkfish/_head.rhtml
@@ -15,8 +15,6 @@
 
 <link href="<%= asset_rel_prefix %>/css/fonts.css" rel="stylesheet">
 <link href="<%= asset_rel_prefix %>/css/rdoc.css" rel="stylesheet">
-<%- if @options.template_stylesheets.flatten.any? then -%>
-<%-   @options.template_stylesheets.flatten.each do |stylesheet| -%>
+<%- @options.template_stylesheets.each do |stylesheet| -%>
 <link href="<%= asset_rel_prefix %>/<%= File.basename stylesheet %>" rel="stylesheet">
-<%-   end -%>
 <%- end -%>
diff --git a/lib/rdoc/options.rb b/lib/rdoc/options.rb
index 7a45a9c610..792b473b79 100644
--- a/lib/rdoc/options.rb
+++ b/lib/rdoc/options.rb
@@ -971,7 +971,7 @@ Usage: #{opt.program_name} [options] [names...]
       opt.on("--template-stylesheets=FILES", PathArray,
              "Set (or add to) the list of files to",
              "include with the html template.") do |value|
-        @template_stylesheets << value
+        @template_stylesheets.concat value
       end
 
       opt.separator nil
diff --git a/test/rdoc/test_rdoc_generator_darkfish.rb b/test/rdoc/test_rdoc_generator_darkfish.rb
index f5858bce6e..3de4f8b6d6 100644
--- a/test/rdoc/test_rdoc_generator_darkfish.rb
+++ b/test/rdoc/test_rdoc_generator_darkfish.rb
@@ -220,6 +220,20 @@ class TestRDocGeneratorDarkfish < RDoc::TestCase
     assert_includes method_name, '{ |%&lt;&lt;script&gt;alert(&quot;atui&quot;)&lt;/script&gt;&gt;, yield_arg| ... }'
   end
 
+  def test_template_stylesheets
+    css = Tempfile.create(%W'hoge .css', Dir.mktmpdir('tmp', '.'))
+    File.write(css, '')
+    base = File.basename(css)
+    refute_file(base)
+
+    @options.template_stylesheets << css
+
+    @g.generate
+
+    assert_file base
+    assert_include File.read('index.html'), %Q[href="./#{base}"]
+  end
+
   ##
   # Asserts that +filename+ has a link count greater than 1 if hard links to
   # @tmpdir are supported.
diff --git a/test/rdoc/test_rdoc_options.rb b/test/rdoc/test_rdoc_options.rb
index 206ddeeb2c..7c264c5e86 100644
--- a/test/rdoc/test_rdoc_options.rb
+++ b/test/rdoc/test_rdoc_options.rb
@@ -632,6 +632,21 @@ rdoc_include:
     $LOAD_PATH.replace orig_LOAD_PATH
   end
 
+  def test_parse_template_stylesheets
+    css = nil
+    Dir.mktmpdir do |dir|
+      css = File.join(dir, "hoge.css")
+      File.write(css, "")
+      out, err = capture_output do
+        @options.parse %W[--template-stylesheets #{css}]
+      end
+
+      assert_empty out
+      assert_empty err
+    end
+    assert_include @options.template_stylesheets, css
+  end
+
   def test_parse_visibility
     @options.parse %w[--visibility=public]
     assert_equal :public, @options.visibility