diff --git a/server/src/routes/files.ts b/server/src/routes/files.ts
index df56864..ce6ef4a 100644
--- a/server/src/routes/files.ts
+++ b/server/src/routes/files.ts
@@ -73,6 +73,12 @@ function formatFile(file: TripFile) {
 }
 
 // List files (excludes soft-deleted by default)
+interface FileLink {
+  file_id: number;
+  reservation_id: number | null;
+  place_id: number | null;
+}
+
 router.get('/', authenticate, (req: Request, res: Response) => {
   const authReq = req as AuthRequest;
   const { tripId } = req.params;
@@ -86,10 +92,10 @@ router.get('/', authenticate, (req: Request, res: Response) => {
 
   // Get all file_links for this trip's files
   const fileIds = files.map(f => f.id);
-  let linksMap: Record<number, number[]> = {};
+  let linksMap: Record<number, FileLink[]> = {};
   if (fileIds.length > 0) {
     const placeholders = fileIds.map(() => '?').join(',');
-    const links = db.prepare(`SELECT file_id, reservation_id, place_id FROM file_links WHERE file_id IN (${placeholders})`).all(...fileIds) as { file_id: number; reservation_id: number | null; place_id: number | null }[];
+    const links = db.prepare(`SELECT file_id, reservation_id, place_id FROM file_links WHERE file_id IN (${placeholders})`).all(...fileIds) as FileLink[];
     for (const link of links) {
       if (!linksMap[link.file_id]) linksMap[link.file_id] = [];
       linksMap[link.file_id].push(link);