diff --git a/site/admin.html b/site/admin.html
index a6b5a9e..97b30d6 100644
--- a/site/admin.html
+++ b/site/admin.html
@@ -97,7 +97,7 @@ async function api(path){ const r = await fetch('/admin'+path, { headers: hdr()
 
 let ROLE = 'staff';
 async function signin(){
-  TOKEN = $('#tok') ? $('#tok').value.trim() : TOKEN;
+  TOKEN = ($('#tok') && $('#tok').value.trim()) || TOKEN;   // keep the stored token if the box is empty
   let me; try { me = await api('/me'); } catch(e){ localStorage.removeItem('rg_token'); location.replace('/login'); return; }
   ROLE = me.role || 'staff';
   localStorage.setItem('rg_token', TOKEN);