diff --git a/src/routes/invoices.$invoiceId.tsx b/src/routes/invoices.$invoiceId.tsx
index d12784c..83bea10 100644
--- a/src/routes/invoices.$invoiceId.tsx
+++ b/src/routes/invoices.$invoiceId.tsx
@@ -207,6 +207,7 @@ function InvoiceDetail() {
         status: invoice.status,
         notes: invoice.notes,
         matter: groups.length === 1 ? (groups[0].caseRow?.title ?? null) : null,
+        caseNumber: groups.length === 1 ? (groups[0].caseRow?.case_number ?? null) : null,
       },
       groups: groups.map((g) => ({
         caseNumber: g.caseRow?.case_number ?? "—",