diff --git a/plugin/business/traffic-mirror/src/entry.cpp b/plugin/business/traffic-mirror/src/entry.cpp
index e435534..3f34c7d 100644
--- a/plugin/business/traffic-mirror/src/entry.cpp
+++ b/plugin/business/traffic-mirror/src/entry.cpp
@@ -408,13 +408,7 @@ static int traffic_mirror_ethdev_init(struct traffic_mirror_instance * instance)
     unsigned int device_type;
     MESA_load_profile_uint_def(profile, "traffic_mirror", "type", &device_type, TRAFFIC_MIRROR_ETHDEV_AF_PACKET);
 
-    ret = MESA_load_profile_string_nodef(profile, "traffic_mirror", "app_symbol", app_symbol, sizeof(app_symbol));
-    if (ret < 0)
-    {
-        TFE_LOG_ERROR(instance->logger, "failed at reading conffile, "
-                                        "[traffic_mirror]app_symbol is not defined.");
-        return -1;
-    }
+    MESA_load_profile_string_def(profile, "traffic_mirror", "app_symbol", app_symbol, sizeof(app_symbol), "tfe-traffic-mirror");
 
     if (device_type == TRAFFIC_MIRROR_ETHDEV_AF_PACKET)
     {