diff --git a/README.md b/README.md
index 61f11c66ba..a80f79f09f 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Gogs - Go Git Service [![Build Status](https://travis-ci.org/gogits/gogs.svg?bra
 
 ![](public/img/gogs-large-resize.png)
 
-##### Current version: 0.6.22 Beta
+##### Current version: 0.6.23 Beta
 
 <table>
     <tr>
diff --git a/gogs.go b/gogs.go
index 343ee5aa4e..a1e32a5735 100644
--- a/gogs.go
+++ b/gogs.go
@@ -17,7 +17,7 @@ import (
 	"github.com/gogits/gogs/modules/setting"
 )
 
-const APP_VER = "0.6.22.1103 Beta"
+const APP_VER = "0.6.23.1103 Beta"
 
 func init() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
diff --git a/models/git_diff.go b/models/git_diff.go
index 3bf938ae40..c1568a5759 100644
--- a/models/git_diff.go
+++ b/models/git_diff.go
@@ -97,7 +97,7 @@ func ParsePatch(pid int64, maxlines int, cmd *exec.Cmd, reader io.Reader) (*Diff
 	var i int
 	for scanner.Scan() {
 		line := scanner.Text()
-		// fmt.Println(i, line)
+
 		if strings.HasPrefix(line, "+++ ") || strings.HasPrefix(line, "--- ") {
 			continue
 		}
@@ -180,8 +180,6 @@ func ParsePatch(pid int64, maxlines int, cmd *exec.Cmd, reader io.Reader) (*Diff
 				b = b[1 : len(b)-1]
 			}
 
-			fmt.Println(a, b)
-
 			curFile = &DiffFile{
 				Name:     a,
 				Index:    len(diff.Files) + 1,
diff --git a/models/pull.go b/models/pull.go
index 0300c083d7..56af5f828d 100644
--- a/models/pull.go
+++ b/models/pull.go
@@ -385,16 +385,18 @@ func (pr *PullRequest) UpdateCols(cols ...string) error {
 var PullRequestQueue = NewUniqueQueue(setting.Repository.PullRequestQueueLength)
 
 // UpdatePatch generates and saves a new patch.
-func (pr *PullRequest) UpdatePatch() error {
-	if err := pr.GetHeadRepo(); err != nil {
+func (pr *PullRequest) UpdatePatch() (err error) {
+	if err = pr.GetHeadRepo(); err != nil {
 		return fmt.Errorf("GetHeadRepo: %v", err)
 	} else if pr.HeadRepo == nil {
 		log.Trace("PullRequest[%d].UpdatePatch: ignored cruppted data", pr.ID)
 		return nil
 	}
 
-	if err := pr.GetBaseRepo(); err != nil {
+	if err = pr.GetBaseRepo(); err != nil {
 		return fmt.Errorf("GetBaseRepo: %v", err)
+	} else if err = pr.BaseRepo.GetOwner(); err != nil {
+		return fmt.Errorf("GetOwner: %v", err)
 	}
 
 	headRepoPath, err := pr.HeadRepo.RepoPath()
@@ -407,6 +409,22 @@ func (pr *PullRequest) UpdatePatch() error {
 		return fmt.Errorf("OpenRepository: %v", err)
 	}
 
+	// Add a temporary remote.
+	tmpRemote := com.ToStr(time.Now().UnixNano())
+	if err = headGitRepo.AddRemote(tmpRemote, RepoPath(pr.BaseRepo.Owner.Name, pr.BaseRepo.Name)); err != nil {
+		return fmt.Errorf("AddRemote: %v", err)
+	}
+	defer func() {
+		headGitRepo.RemoveRemote(tmpRemote)
+	}()
+	remoteBranch := "remotes/" + tmpRemote + "/" + pr.BaseBranch
+	pr.MergeBase, err = headGitRepo.GetMergeBase(remoteBranch, pr.HeadBranch)
+	if err != nil {
+		return fmt.Errorf("GetMergeBase: %v", err)
+	} else if err = pr.Update(); err != nil {
+		return fmt.Errorf("Update: %v", err)
+	}
+
 	patch, err := headGitRepo.GetPatch(pr.MergeBase, pr.HeadBranch)
 	if err != nil {
 		return fmt.Errorf("GetPatch: %v", err)
diff --git a/modules/git/repo_pull.go b/modules/git/repo_pull.go
index a9cc33a1d4..16b9536fe6 100644
--- a/modules/git/repo_pull.go
+++ b/modules/git/repo_pull.go
@@ -20,31 +20,55 @@ type PullRequestInfo struct {
 	NumFiles int
 }
 
+// GetMergeBase checks and returns merge base of two branches.
+func (repo *Repository) GetMergeBase(remoteBranch, headBranch string) (string, error) {
+	// Get merge base commit.
+	stdout, stderr, err := com.ExecCmdDir(repo.Path, "git", "merge-base", remoteBranch, headBranch)
+	if err != nil {
+		return "", fmt.Errorf("get merge base: %v", concatenateError(err, stderr))
+	}
+	return strings.TrimSpace(stdout), nil
+}
+
+// AddRemote adds a remote to repository.
+func (repo *Repository) AddRemote(name, path string) error {
+	_, stderr, err := com.ExecCmdDir(repo.Path, "git", "remote", "add", "-f", name, path)
+	if err != nil {
+		return fmt.Errorf("add remote(%s - %s): %v", name, path, concatenateError(err, stderr))
+	}
+	return nil
+}
+
+// RemoveRemote removes a remote from repository.
+func (repo *Repository) RemoveRemote(name string) error {
+	_, stderr, err := com.ExecCmdDir(repo.Path, "git", "remote", "remove", name)
+	if err != nil {
+		return fmt.Errorf("remove remote(%s): %v", name, concatenateError(err, stderr))
+	}
+	return nil
+}
+
 // GetPullRequestInfo generates and returns pull request information
 // between base and head branches of repositories.
-func (repo *Repository) GetPullRequestInfo(basePath, baseBranch, headBranch string) (*PullRequestInfo, error) {
+func (repo *Repository) GetPullRequestInfo(basePath, baseBranch, headBranch string) (_ *PullRequestInfo, err error) {
 	// Add a temporary remote.
 	tmpRemote := com.ToStr(time.Now().UnixNano())
-	_, stderr, err := com.ExecCmdDir(repo.Path, "git", "remote", "add", "-f", tmpRemote, basePath)
-	if err != nil {
-		return nil, fmt.Errorf("add base as remote: %v", concatenateError(err, stderr))
+	if err = repo.AddRemote(tmpRemote, basePath); err != nil {
+		return nil, fmt.Errorf("AddRemote: %v", err)
 	}
 	defer func() {
-		com.ExecCmdDir(repo.Path, "git", "remote", "remove", tmpRemote)
+		repo.RemoveRemote(tmpRemote)
 	}()
 
-	prInfo := new(PullRequestInfo)
-
-	var stdout string
 	remoteBranch := "remotes/" + tmpRemote + "/" + baseBranch
-	// Get merge base commit.
-	stdout, stderr, err = com.ExecCmdDir(repo.Path, "git", "merge-base", remoteBranch, headBranch)
-	if err != nil {
-		return nil, fmt.Errorf("get merge base: %v", concatenateError(err, stderr))
-	}
-	prInfo.MergeBase = strings.TrimSpace(stdout)
 
-	stdout, stderr, err = com.ExecCmdDir(repo.Path, "git", "log", prInfo.MergeBase+"..."+headBranch, prettyLogFormat)
+	prInfo := new(PullRequestInfo)
+	prInfo.MergeBase, err = repo.GetMergeBase(remoteBranch, headBranch)
+	if err != nil {
+		return nil, fmt.Errorf("GetMergeBase: %v", err)
+	}
+
+	stdout, stderr, err := com.ExecCmdDir(repo.Path, "git", "log", prInfo.MergeBase+"..."+headBranch, prettyLogFormat)
 	if err != nil {
 		return nil, fmt.Errorf("list diff logs: %v", concatenateError(err, stderr))
 	}
diff --git a/templates/.VERSION b/templates/.VERSION
index 364e36fc76..815df4fe64 100644
--- a/templates/.VERSION
+++ b/templates/.VERSION
@@ -1 +1 @@
-0.6.22.1103 Beta
\ No newline at end of file
+0.6.23.1103 Beta
\ No newline at end of file