diff --git a/src/components/cases/documents-tab.tsx b/src/components/cases/documents-tab.tsx
index 2f0fbb0..b25823b 100644
--- a/src/components/cases/documents-tab.tsx
+++ b/src/components/cases/documents-tab.tsx
@@ -121,8 +121,7 @@ export function CaseDocumentsTab({ caseId }: { caseId: string }) {
     let ok = 0;
     for (const f of list) {
       // webkitRelativePath supports folder uploads when input has webkitdirectory
-      // @ts-expect-error – non-standard but widely supported
-      const rel: string = f.webkitRelativePath || "";
+      const rel: string = (f as File & { webkitRelativePath?: string }).webkitRelativePath || "";
       let folderForFile = baseFolder;
       if (rel && rel.includes("/")) {
         const parts = rel.split("/");