diff --git a/drivers/usb/gadget/f_sdp.c b/drivers/usb/gadget/f_sdp.c
index 2d0b2fb2b1..c06b11b3fb 100644
--- a/drivers/usb/gadget/f_sdp.c
+++ b/drivers/usb/gadget/f_sdp.c
@@ -542,7 +542,7 @@ static struct usb_request *sdp_start_ep(struct usb_ep *ep)
 {
 	struct usb_request *req;
 
-	req = alloc_ep_req(ep, 64);
+	req = alloc_ep_req(ep, 65);
 	debug("%s: ep:%p req:%p\n", __func__, ep, req);
 
 	if (!req)