diff --git a/lambdas/po/web_ui/handler.py b/lambdas/po/web_ui/handler.py
index cbbfbaa..beaa174 100644
--- a/lambdas/po/web_ui/handler.py
+++ b/lambdas/po/web_ui/handler.py
@@ -196,7 +196,7 @@ def render_po_list(purchase_orders):
         processed = esc((po.get("processed_at") or "")[:16])
 
         rows += f"""
-        <tr style="border-bottom:1px solid #f1f5f9;cursor:pointer;" onclick="window.location={esc(json.dumps(f'/po?id={po.get("po_number", "")}'), quote=True)}">
+        <tr style="border-bottom:1px solid #f1f5f9;cursor:pointer;" onclick="window.location={esc(json.dumps(f"/po?id={po.get("po_number", "")}"), quote=True)}">
             <td style="padding:12px;font-weight:500;color:#3b82f6;">{po_number}</td>
             <td style="padding:12px;">{supplier}</td>
             <td style="padding:12px;font-weight:500;">{site_code}</td>
diff --git a/lambdas/wo/web_ui/handler.py b/lambdas/wo/web_ui/handler.py
index 9ac07c1..4af9120 100644
--- a/lambdas/wo/web_ui/handler.py
+++ b/lambdas/wo/web_ui/handler.py
@@ -174,7 +174,7 @@ def render_work_orders_list(work_orders):
         updated = esc((wo.get("updated_at") or "")[:16])
 
         rows += f"""
-        <tr style="border-bottom:1px solid #f1f5f9;cursor:pointer;" onclick="window.location={esc(json.dumps(f'/wo?id={wo.get("work_order_id", "")}'), quote=True)}">
+        <tr style="border-bottom:1px solid #f1f5f9;cursor:pointer;" onclick="window.location={esc(json.dumps(f"/wo?id={wo.get("work_order_id", "")}"), quote=True)}">
             <td style="padding:12px;font-weight:500;color:#3b82f6;">{wo_id}</td>
             <td style="padding:12px;max-width:250px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">{desc}</td>
             <td style="padding:12px;">{site}</td>