diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index 45e55a2f9..42a01cc11 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -1032,8 +1032,8 @@ func NewContext() {
 	newMarkup()
 
 	sec = Cfg.Section("U2F")
-	U2F.TrustedFacets, _ = shellquote.Split(sec.Key("TRUSTED_FACETS").MustString(strings.TrimRight(AppURL, "/")))
-	U2F.AppID = sec.Key("APP_ID").MustString(strings.TrimRight(AppURL, "/"))
+	U2F.TrustedFacets, _ = shellquote.Split(sec.Key("TRUSTED_FACETS").MustString(strings.TrimSuffix(AppURL, AppSubURL+"/")))
+	U2F.AppID = sec.Key("APP_ID").MustString(strings.TrimSuffix(AppURL, "/"))
 
 	zip.Verbose = false