diff --git lib/redmine/scm/adapters/git_adapter.rb lib/redmine/scm/adapters/git_adapter.rb
index 3c9758a..f90ac62 100644
--- lib/redmine/scm/adapters/git_adapter.rb
+++ lib/redmine/scm/adapters/git_adapter.rb
@@ -15,6 +15,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
+require 'redmine/scm/adapters'
 require 'redmine/scm/adapters/abstract_adapter'
 
 module Redmine