diff --git a/lib/net/http/header.rb b/lib/net/http/header.rb
index 6106e79..b5c13cc 100644
--- a/lib/net/http/header.rb
+++ b/lib/net/http/header.rb
@@ -773,8 +773,16 @@ def type_params
     list = self['Content-Type'].to_s.split(';')
     list.shift
     list.each do |param|
-      k, v = *param.split('=', 2)
-      result[k.strip] = v.strip
+      k, v = param.split('=', 2)
+      k.strip!
+      v.strip!
+      v.gsub!(/\A"(.*?)(?<!\\)"\z/) do
+        v2 = $1
+        v2.gsub!(/\\(.)/, '\1')
+        v2
+      end
+      v.strip!
+      result[k] = v
     end
     result
   end
diff --git a/test/net/http/test_httpheader.rb b/test/net/http/test_httpheader.rb
index f4b7860..d554e4c 100644
--- a/test/net/http/test_httpheader.rb
+++ b/test/net/http/test_httpheader.rb
@@ -466,6 +466,8 @@ def test_type_params
     assert_equal({'charset' => 'iso-2022-jp'}, @c.type_params)
     @c.content_type = 'text'
     assert_equal({}, @c.type_params)
+    @c['content-type'] = 'text/html; charset="UTF\-8"'
+    assert_equal({'charset' => 'UTF-8'}, @c.type_params)
   end
 
   def test_set_content_type