diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index a2320a20ed..8a17b40083 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -719,6 +719,9 @@ mirror_address_desc = Put any required credentials in the Clone Authorization se
 mirror_address_url_invalid = The provided url is invalid. You must escape all components of the url correctly.
 mirror_address_protocol_invalid = The provided url is invalid. Only http(s):// or git:// locations can be mirrored from.
 mirror_last_synced = Last Synchronized
+mirror_password_placeholder = (Unchanged)
+mirror_password_blank_placeholder = (Unset)
+mirror_password_help = Change the username to erase a stored password.
 watchers = Watchers
 stargazers = Stargazers
 forks = Forks
diff --git a/routers/repo/setting.go b/routers/repo/setting.go
index effa7483cd..e46c883b7b 100644
--- a/routers/repo/setting.go
+++ b/routers/repo/setting.go
@@ -164,6 +164,12 @@ func SettingsPost(ctx *context.Context) {
 			}
 		}
 
+		oldUsername := mirror_service.Username(ctx.Repo.Mirror)
+		oldPassword := mirror_service.Password(ctx.Repo.Mirror)
+		if form.MirrorPassword == "" && form.MirrorUsername == oldUsername {
+			form.MirrorPassword = oldPassword
+		}
+
 		address, err := auth.ParseRemoteAddr(form.MirrorAddress, form.MirrorUsername, form.MirrorPassword)
 		if err == nil {
 			err = migrations.IsMigrateURLAllowed(address, ctx.User)
diff --git a/templates/repo/settings/options.tmpl b/templates/repo/settings/options.tmpl
index f944eb8d8d..2a69c63de3 100644
--- a/templates/repo/settings/options.tmpl
+++ b/templates/repo/settings/options.tmpl
@@ -107,8 +107,9 @@
 							<input class="fake" type="password">
 							<div class="inline field {{if .Err_Auth}}error{{end}}">
 								<label for="mirror_password">{{.i18n.Tr "password"}}</label>
-								<input id="mirror_password" name="mirror_password" type="password" value="{{MirrorPassword .Mirror}}" {{if not .mirror_password}}data-need-clear="true"{{end}} autocomplete="off">
-							</div>
+								<input id="mirror_password" name="mirror_password" type="password" placeholder="{{if MirrorPassword .Mirror }}{{.i18n.Tr "repo.mirror_password_placeholder"}}{{else}}{{.i18n.Tr "repo.mirror_password_blank_placeholder"}}{{end}}" value="" {{if not .mirror_password}}data-need-clear="true"{{end}} autocomplete="off">
+ 							</div>
+							<p class="help">{{.i18n.Tr "repo.mirror_password_help"}}</p>
 						</div>
 					</div>