diff --git a/app/controllers/wiki_controller.rb b/app/controllers/wiki_controller.rb
index a1d68edc5..17faf2a74 100644
--- a/app/controllers/wiki_controller.rb
+++ b/app/controllers/wiki_controller.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 'diff'
-
 # The WikiController follows the Rails REST controller pattern but with
 # a few differences
 #