diff --git a/demo/os/linux/easylogger/plugins/file/elog_file_port.c b/demo/os/linux/easylogger/plugins/file/elog_file_port.c
index 74b92e0..b3fbec0 100644
--- a/demo/os/linux/easylogger/plugins/file/elog_file_port.c
+++ b/demo/os/linux/easylogger/plugins/file/elog_file_port.c
@@ -115,7 +115,7 @@ static void lock_init(void)
         sembuf.sem_op = 1;
         sembuf.sem_flg = 0;
 
-        rc = semop(semid, &sembuf, 1);
+        rc = semop(id, &sembuf, 1);
         if (rc == -1)
             goto __exit;
     }