diff --git a/kernel/model/sync.go b/kernel/model/sync.go
index 6356719fa..e8e3a1a1c 100644
--- a/kernel/model/sync.go
+++ b/kernel/model/sync.go
@@ -315,6 +315,7 @@ func SetSyncProviderS3(s3 *conf.S3) (err error) {
 	defer syncLock.Unlock()
 
 	s3.Endpoint = strings.TrimSpace(s3.Endpoint)
+	s3.Endpoint = util.NormalizeEndpoint(s3.Endpoint)
 	s3.AccessKey = strings.TrimSpace(s3.AccessKey)
 	s3.SecretKey = strings.TrimSpace(s3.SecretKey)
 	s3.Bucket = strings.TrimSpace(s3.Bucket)
@@ -330,6 +331,7 @@ func SetSyncProviderWebDAV(webdav *conf.WebDAV) (err error) {
 	defer syncLock.Unlock()
 
 	webdav.Endpoint = strings.TrimSpace(webdav.Endpoint)
+	webdav.Endpoint = util.NormalizeEndpoint(webdav.Endpoint)
 	webdav.Username = strings.TrimSpace(webdav.Username)
 	webdav.Password = strings.TrimSpace(webdav.Password)