diff --git a/src/MESA_handle_logger.c b/src/MESA_handle_logger.c
index eb37b44..35348c1 100644
--- a/src/MESA_handle_logger.c
+++ b/src/MESA_handle_logger.c
@@ -133,7 +133,7 @@ static void snapshot_handle_info(const char *handle_name, int level)
             return;
         }
         int len = snprintf(zlog_rule_conf_content, sizeof(zlog_rule_conf_content),
-                 "[global]\ndefault format = \"%%d(%%c), %%V, %%m%%n\" \n[levels]\nDEBUG=10\nINFO=20\nFATAL=30\n[rules]");
+                 "[global]\ndefault format = \"%%d(%%c), %%V, %U, %%m%%n\" \n[levels]\nDEBUG=10\nINFO=20\nFATAL=30\n[rules]");
         write(g_zlog_conf_fp, zlog_rule_conf_content, strlen(zlog_rule_conf_content));
         fsync(g_zlog_conf_fp);
     }