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-rw-r--r--lib/redmine/helpers/diff.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/redmine/helpers/diff.rb b/lib/redmine/helpers/diff.rb
index 537bfa05d..d580f689c 100644
--- a/lib/redmine/helpers/diff.rb
+++ b/lib/redmine/helpers/diff.rb
@@ -15,6 +15,8 @@
# 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'
+
module Redmine
module Helpers
class Diff