diff --git a/panel/src/pages/Transactions.tsx b/panel/src/pages/Transactions.tsx
index 0e3172f..f7c0d48 100644
--- a/panel/src/pages/Transactions.tsx
+++ b/panel/src/pages/Transactions.tsx
@@ -63,7 +63,8 @@ const PAGE_SIZES = [25, 50, 100];
 
 function formatAmount(amount: string): string {
   const n = BigInt(amount);
-  return n.toLocaleString();
+  const abs = n < 0n ? -n : n;
+  return abs.toLocaleString();
 }
 
 function formatDate(iso: string): string {