diff --git a/src/main/scala/app/AccountController.scala b/src/main/scala/app/AccountController.scala
index 3304480..56ad902 100644
--- a/src/main/scala/app/AccountController.scala
+++ b/src/main/scala/app/AccountController.scala
@@ -291,7 +291,7 @@
    * Create new repository.
    */
   post("/new", newRepositoryForm)(usersOnly { form =>
-    LockUtil.lock(s"${form.owner}/${form.name}/create"){
+    LockUtil.lock(s"${form.owner}/${form.name}"){
       if(getRepository(form.owner, form.name, context.baseUrl).isEmpty){
         val ownerAccount  = getAccountByUserName(form.owner).get
         val loginAccount  = context.loginAccount.get
@@ -354,7 +354,7 @@
     val loginAccount   = context.loginAccount.get
     val loginUserName  = loginAccount.userName
 
-    LockUtil.lock(s"${loginUserName}/${repository.name}/create"){
+    LockUtil.lock(s"${loginUserName}/${repository.name}"){
       if(repository.owner == loginUserName || getRepository(loginAccount.userName, repository.name, baseUrl).isDefined){
         // redirect to the repository if repository already exists
         redirect(s"/${loginUserName}/${repository.name}")
diff --git a/src/main/scala/app/PullRequestsController.scala b/src/main/scala/app/PullRequestsController.scala
index 174160f..41d35bd 100644
--- a/src/main/scala/app/PullRequestsController.scala
+++ b/src/main/scala/app/PullRequestsController.scala
@@ -13,7 +13,6 @@
 import service.IssuesService._
 import service.PullRequestService._
 import util.JGitUtil.DiffInfo
-import service.RepositoryService.RepositoryTreeNode
 import util.JGitUtil.CommitInfo
 import org.slf4j.LoggerFactory
 import org.eclipse.jgit.merge.MergeStrategy
@@ -124,7 +123,7 @@
     params("id").toIntOpt.flatMap { issueId =>
       val owner = repository.owner
       val name  = repository.name
-      LockUtil.lock(s"${owner}/${name}/merge"){
+      LockUtil.lock(s"${owner}/${name}"){
         getPullRequest(owner, name, issueId).map { case (issue, pullreq) =>
           using(Git.open(getRepositoryDir(owner, name))) { git =>
             // mark issue as merged and close.
@@ -367,7 +366,7 @@
    */
   private def checkConflict(userName: String, repositoryName: String, branch: String,
                             requestUserName: String, requestRepositoryName: String, requestBranch: String): Boolean = {
-    LockUtil.lock(s"${userName}/${repositoryName}/merge-check"){
+    LockUtil.lock(s"${userName}/${repositoryName}"){
       using(Git.open(getRepositoryDir(requestUserName, requestRepositoryName))) { git =>
         val remoteRefName = s"refs/heads/${branch}"
         val tmpRefName = s"refs/merge-check/${userName}/${branch}"
@@ -403,7 +402,7 @@
   private def checkConflictInPullRequest(userName: String, repositoryName: String, branch: String,
                                          requestUserName: String, requestRepositoryName: String, requestBranch: String,
                                          issueId: Int): Boolean = {
-    LockUtil.lock(s"${userName}/${repositoryName}/merge") {
+    LockUtil.lock(s"${userName}/${repositoryName}") {
       using(Git.open(getRepositoryDir(userName, repositoryName))) { git =>
         // merge
         val merger = MergeStrategy.RECURSIVE.newMerger(git.getRepository, true)
diff --git a/src/main/scala/app/RepositorySettingsController.scala b/src/main/scala/app/RepositorySettingsController.scala
index 92b4360..ed30d93 100644
--- a/src/main/scala/app/RepositorySettingsController.scala
+++ b/src/main/scala/app/RepositorySettingsController.scala
@@ -2,7 +2,7 @@
 
 import service._
 import util.Directory._
-import util.{UsersAuthenticator, OwnerAuthenticator}
+import util.{LockUtil, UsersAuthenticator, OwnerAuthenticator}
 import jp.sf.amateras.scalatra.forms._
 import org.apache.commons.io.FileUtils
 import org.scalatra.i18n.Messages
@@ -185,15 +185,17 @@
   post("/:owner/:repository/settings/transfer", transferForm)(ownerOnly { (form, repository) =>
     // Change repository owner
     if(repository.owner != form.newOwner){
-      // Update database
-      renameRepository(repository.owner, repository.name, form.newOwner, repository.name)
-      // Move git repository
-      defining(getRepositoryDir(repository.owner, repository.name)){ dir =>
-        FileUtils.moveDirectory(dir, getRepositoryDir(form.newOwner, repository.name))
-      }
-      // Move wiki repository
-      defining(getWikiRepositoryDir(repository.owner, repository.name)){ dir =>
-        FileUtils.moveDirectory(dir, getWikiRepositoryDir(form.newOwner, repository.name))
+      LockUtil.lock(s"${repository.owner}/${repository.name}"){
+        // Update database
+        renameRepository(repository.owner, repository.name, form.newOwner, repository.name)
+        // Move git repository
+        defining(getRepositoryDir(repository.owner, repository.name)){ dir =>
+          FileUtils.moveDirectory(dir, getRepositoryDir(form.newOwner, repository.name))
+        }
+        // Move wiki repository
+        defining(getWikiRepositoryDir(repository.owner, repository.name)){ dir =>
+          FileUtils.moveDirectory(dir, getWikiRepositoryDir(form.newOwner, repository.name))
+        }
       }
     }
     redirect(s"/${form.newOwner}/${repository.name}")
@@ -203,12 +205,13 @@
    * Delete the repository.
    */
   post("/:owner/:repository/settings/delete")(ownerOnly { repository =>
-    deleteRepository(repository.owner, repository.name)
+    LockUtil.lock(s"${repository.owner}/${repository.name}"){
+      deleteRepository(repository.owner, repository.name)
 
-    FileUtils.deleteDirectory(getRepositoryDir(repository.owner, repository.name))
-    FileUtils.deleteDirectory(getWikiRepositoryDir(repository.owner, repository.name))
-    FileUtils.deleteDirectory(getTemporaryDir(repository.owner, repository.name))
-
+      FileUtils.deleteDirectory(getRepositoryDir(repository.owner, repository.name))
+      FileUtils.deleteDirectory(getWikiRepositoryDir(repository.owner, repository.name))
+      FileUtils.deleteDirectory(getTemporaryDir(repository.owner, repository.name))
+    }
     redirect(s"/${repository.owner}")
   })