--- a/util/logging.c
+++ b/util/logging.c
@@ -114,9 +114,9 @@ void start_log() {
 			    g_dest = LOG_TO_CONSOLE;
 			    PR_ERRNO("日志文件打开失败，将输出至控制台");
 			}
-			setvbuf(g_log_fp, NULL, _IOLBF, BUFSIZ);
 			break;
 	}
+	setvbuf(g_log_fp, NULL, _IOLBF, BUFSIZ);
 }
 
 void close_log() {