diff --git a/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/V2RayFmt.kt b/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/V2RayFmt.kt
index 6cddaf7..6d69e9c 100644
--- a/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/V2RayFmt.kt
+++ b/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/V2RayFmt.kt
@@ -146,7 +146,7 @@ fun StandardV2RayBean.parseDuckSoft(url: HttpUrl) {
     if (type == "h2") type = "http"
 
     security = url.queryParameter("security")
-    if (security == null) {
+    if (security.isNullOrBlank()) {
         security = if (this is TrojanBean) "tls" else "none"
     }