diff --git a/tools/workers/page/workers.html b/tools/workers/page/workers.html
index 4d103794..c8cd8333 100644
--- a/tools/workers/page/workers.html
+++ b/tools/workers/page/workers.html
@@ -245,7 +245,7 @@ function renderCrew() {
 function nowItems() {
   const out = [];
   for (const bx of boxesOf(D)) for (const r of bx.running || []) out.push({ where: bx.name, slot: r.slot, title: `${kindLabel(r.kind)}`, sub: `${r.worktree || '?'}/${r.crate || ''}${r.agent ? ' · ' + r.agent : ''}`, cmd: r.command, started_at: r.started_at, kind: r.kind, extra: [r.target || '', classLine(r)].filter(Boolean).join(' · ') });
-  for (const bx of boxesOf(D)) for (const h of (bx.slots && bx.slots.held || []).filter(h => h.no_line && !(bx.running || []).some(r => r.slot === h.slot))) out.push({ where: bx.name, slot: h.slot, title: 'held, no holder line', sub: 'the slot is flock-held but its file is empty (the holder wrote no line)', cmd: '', started_at: null, kind: null, extra: '' });
+  for (const bx of boxesOf(D)) for (const h of (bx.slots && bx.slots.held || []).filter(h => h.no_line && /^build-\d+$/.test(h.slot) && !(bx.running || []).some(r => r.slot === h.slot))) out.push({ where: bx.name, slot: h.slot, title: 'held, no holder line', sub: 'the slot is flock-held but its file is empty (the holder wrote no line)', cmd: '', started_at: null, kind: null, extra: '' });
   for (const h of (D.mac && D.mac.slots.held) || []) out.push({ where: D.mac.name, slot: h.slot, title: h.slot === 'measure' ? 'measurement' : h.slot.startsWith('run') ? 'functional run' : kindLabel(h.kind), sub: h.worktree || 'this Mac', cmd: h.command || h.label, started_at: h.since, kind: h.kind, extra: h.waited_s ? `waited ${fmtDur(h.waited_s)}` : '' });
   for (const pc of (D.pcs && D.pcs.machines) || []) if (pc.running) out.push({ where: pc.name, slot: 'relay job', title: `${pc.running.kind} ${pc.running.job}`, sub: pc.running.title || pc.machine || '', cmd: pc.running.stage ? `stage ${pc.running.stage}` : 'reports every 5 min while it runs', started_at: pc.running.started_at, kind: pc.running.kind, extra: pc.running.last_report_at ? `last report ${ago(pc.running.last_report_at)}` : '' });
   return out;