diff --git a/routers/api/v1/api.go b/routers/api/v1/api.go
index 73338e51b..42de8d248 100644
--- a/routers/api/v1/api.go
+++ b/routers/api/v1/api.go
@@ -583,7 +583,7 @@ func Routes() *web.Route {
 	m.Use(context.ToggleAPI(&context.ToggleOptions{
 		SignInRequired: setting.Service.RequireSignInView,
 	}))
-
+	reqRepoCodeReader := context.RequireRepoReader(models.UnitTypeCode)
 	m.Group("", func() {
 		// Miscellaneous
 		if setting.API.EnableSwagger {
@@ -757,8 +757,8 @@ func Routes() *web.Route {
 					m.Get("/files", context.RepoRef(), repo.GetPullFiles)
 					m.Get("/issues", context.RepoRef(), repo.GetPullIssues)
 				})
-				// m.Get("/compare/*", context.RepoAssignment(), repo.MustBeNotEmpty, reqRepoCodeReader,
-				// 	repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.CompareDiff)
+				m.Get("/compare/*", repo.MustBeNotEmpty, reqRepoCodeReader,
+					repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.CompareDiff)
 				// m.Get("/src/commit/*", context.RepoRefByType(context.RepoRefCommit), repo.GetFileContents)
 				m.Get("/src/commit/*", context.RepoRefByType(context.RepoRefCommit), repo.GetFileContents)
 				//end by coder