diff --git a/src/main/scala/gitbucket/core/controller/ApiController.scala b/src/main/scala/gitbucket/core/controller/ApiController.scala
index 384fa9d..384950a 100644
--- a/src/main/scala/gitbucket/core/controller/ApiController.scala
+++ b/src/main/scala/gitbucket/core/controller/ApiController.scala
@@ -12,6 +12,7 @@
 import gitbucket.core.util._
 import gitbucket.core.view.helpers.{isRenderable, renderMarkup}
 import org.eclipse.jgit.api.Git
+import org.eclipse.jgit.revwalk.RevWalk
 import org.scalatra.{Created, NoContent, UnprocessableEntity}
 
 import scala.collection.JavaConverters._