diff --git a/src/serial_AT.cpp b/src/serial_AT.cpp
index 2fb4880..388c0f1 100644
--- a/src/serial_AT.cpp
+++ b/src/serial_AT.cpp
@@ -89,8 +89,6 @@ static void parse_qeng_servingcell(const std::string& line)
     // 语法检查
     if (t[0] != "servingcell") return;
 
-    std::string rat = t[2];
-
     std::string state = (t.size() > 1 ? t[1] : "");
     std::string rat = (t.size() > 2 ? t[2] : "");