diff --git a/backend/src/routes/deposit.ts b/backend/src/routes/deposit.ts
index 6cbcba9..a499b75 100644
--- a/backend/src/routes/deposit.ts
+++ b/backend/src/routes/deposit.ts
@@ -194,7 +194,7 @@ const deposit: FastifyPluginAsync = async (fastify) => {
   )
 
   // ── POST /api/hotels/:slug/bookings/:bookingId/deposit/release ────────────
-  fastify.post<SlugBookingParam & { Body: { capturedAmount: number; reason?: string } }>(
+  fastify.post<SlugBookingParam & { Body: { captured_amount: number; reason?: string } }>(
     '/api/hotels/:slug/bookings/:bookingId/deposit/release',
     { onRequest: [fastify.authenticate] },
     async (request, reply) => {
@@ -205,7 +205,7 @@ const deposit: FastifyPluginAsync = async (fastify) => {
       const hotelId = await getHotelId(slug)
       if (!hotelId) return reply.code(404).send({ error: 'Hotel not found' })
 
-      const { capturedAmount, reason } = request.body
+      const { captured_amount: capturedAmount, reason } = request.body
 
       // Get active deposit
       const { rows: depRows } = await db.query(