diff --git a/lib/redmine/mime_type.rb b/lib/redmine/mime_type.rb
index 4ff04664d..73ac1fe4c 100644
--- a/lib/redmine/mime_type.rb
+++ b/lib/redmine/mime_type.rb
@@ -15,8 +15,6 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-require 'mime/types'
-
 module Redmine
   module MimeType