diff --git a/routers/web/repo/compare.go b/routers/web/repo/compare.go
index 8d08fec8fdb8..2f23ff846833 100644
--- a/routers/web/repo/compare.go
+++ b/routers/web/repo/compare.go
@@ -215,21 +215,25 @@ func ParseCompareInfo(ctx *context.Context) *CompareInfo {
 	)
 
 	infoPath = ctx.Params("*")
-	infos := strings.SplitN(infoPath, "...", 2)
-
-	if len(infos) != 2 {
-		infos = []string{baseRepo.DefaultBranch, infoPath}
-		if strings.Contains(infoPath, "..") {
-			infos = strings.SplitN(infoPath, "..", 2)
-			ci.DirectComparison = true
-			ctx.Data["PageIsComparePull"] = false
+	var infos []string
+	if infoPath == "" {
+		infos = []string{ctx.Repo.Repository.DefaultBranch, ctx.Repo.Repository.DefaultBranch}
+	} else {
+		infos = strings.SplitN(infoPath, "...", 2)
+		if len(infos) != 2 {
+			infos = []string{baseRepo.DefaultBranch, infoPath}
+			if strings.Contains(infoPath, "..") {
+				infos = strings.SplitN(infoPath, "..", 2)
+				ci.DirectComparison = true
+				ctx.Data["PageIsComparePull"] = false
+			}
 		}
-	}
 
-	if len(infos) != 2 {
-		log.Trace("ParseCompareInfo[%d]: not enough compared branches information %s", baseRepo.ID, infos)
-		ctx.NotFound("CompareAndPullRequest", nil)
-		return nil
+		if len(infos) != 2 {
+			log.Trace("ParseCompareInfo[%d]: not enough compared branches information %s", baseRepo.ID, infos)
+			ctx.NotFound("CompareAndPullRequest", nil)
+			return nil
+		}
 	}
 
 	ctx.Data["BaseName"] = baseRepo.OwnerName
diff --git a/routers/web/web.go b/routers/web/web.go
index 0d4d3bd90f4f..8e87023387a6 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -702,6 +702,7 @@ func RegisterRoutes(m *web.Route) {
 		m.Group("/milestone", func() {
 			m.Get("/{id}", repo.MilestoneIssuesAndPulls)
 		}, reqRepoIssuesOrPullsReader, context.RepoRef())
+		m.Get("/compare", repo.MustBeNotEmpty, reqRepoCodeReader, repo.SetEditorconfigIfExists, ignSignIn, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.CompareDiff)
 		m.Combo("/compare/*", repo.MustBeNotEmpty, reqRepoCodeReader, repo.SetEditorconfigIfExists).
 			Get(ignSignIn, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.CompareDiff).
 			Post(reqSignIn, context.RepoMustNotBeArchived(), reqRepoPullsReader, repo.MustAllowPulls, bindIgnErr(forms.CreateIssueForm{}), repo.SetWhitespaceBehavior, repo.CompareAndPullRequestPost)