diff --git a/components/lwp/terminal/freebsd/tty_pts.c b/components/lwp/terminal/freebsd/tty_pts.c
index 565fb95773f8..d25e668d861c 100644
--- a/components/lwp/terminal/freebsd/tty_pts.c
+++ b/components/lwp/terminal/freebsd/tty_pts.c
@@ -803,7 +803,7 @@ int pts_alloc(int fflags, struct rt_thread *td, struct dfs_file *ptm_file)
 #else
     rootpath = ptyfs_get_rootpath(ptmx_device);
     RT_ASSERT(rootpath[strlen(rootpath) - 1] != '/');
-    snprintf(name_buf, DIRENT_NAME_MAX, "%s/%u", rootpath, psc->pts_unit);
+    snprintf(name_buf, DIRENT_NAME_MAX, "%s/%d", rootpath, psc->pts_unit);
 
     /* setup the pts */
     lwp_tty_register(tp, name_buf);